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🎰 Computer processing in the exploration and evaluation of the Angovia gold deposit. - Free Online Library

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Placer mining is the technique by which gold that has accumulated in a placer deposit is extracted. Placer deposits are composed of relatively loose material that makes tunneling difficult, and so most means of extracting it involve the use of water or dredging.


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This is my page of information on gold geology. Gold is truly beautiful stuff and its not surprising that people seek to find and accumulate it. Some individuals have made a lot of money by knowing the geology of gold deposits and getting out into the field and finding them. Want to know hoe to find your own gold deposit?


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Formation of gold deposits: Review and evaluation of the continuum model | Request PDF
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"The resulting gold is not pure, but has the composition of the natural alloy. Before accurate calculations of value are possible, the gold must be obtained pure and weighed carefully. To purify the gold it should be melted with silver, rolled out or hammered thin, boiled twice with nitric acid, washed, dried, and heated to redness.


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GOLD MINING GEOLOGY !!! What To Look For . ask Jeff Williams

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The gold is hosted by a buried palaeochannel, the Gorge Creek Lead and by an overlying remnant meander of the Cape River.. Evaluation of an Alluvial Gold Deposit.


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Reading a river, where does gold deposit.

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Placer deposits provided early man with the first samples of gold and since that time have accounted for a large production of the metal. If we include the Witwatersrand and other quartz-pebble conglomerates as fossil placers or modified fossil placers, then the placer type of deposit has provided more than two-thirds of man's store of gold.


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Gold is rarely visible, but occurs invisibly in arsenian pyrite and sphalerite (Asadi Harooni, 2000). The petrography, mineralogy and trace element geochemistry of the Zarshuran gold deposit show that it is a Carlin-like sediment-hosted disseminated gold deposit (Asadi Harooni, 2000).


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Using the Sydney real-estate metaphor, we would plot m2 values against distance from the sea.
We plot developers using Prefeasibility or Feasibility Study Life of Mine average AISC estimates.
Developers generally plot at lower values than miners with the same margin.
As they advance their studies and secure funding, values creep right to join the miners' value.
For example developer Gold Road having already secured funding is plotting with the miners.
The trend among developers is weak to absent, with value presumably controlled more by development stage.
Looking at the miners, an outlier on the low value side is Centerra Gold.
This is not surprising considering the ongoing friction with the Kyrgyz government who are part owner and host to their main asset Kumtor.
An outlier on the high value side is Detour Gold.
Detour is in the process of ramping up into a new mine plan that was released in early 2016.
Newmont is a higher value outlier.
Whether this means it is overvalued is not clear.
There may be an element of winner takes all, gold deposit evaluation large funds who are only interested get minted slots the biggest gold miners all piling into Newmont over Barrick.
However this effect is not consistent, as other companies with 50% reserves sit within or below the trend.
It is interesting that Newmont are one get minted slots the few who calculated AISC to the letter of the WGC guidelines Dundee Capital Markets, June 2016.
If they were to fudge the numbers a little more like everyone else, they would have a higher margin and plot closer to the trend.
Improving the correlation Most obviously, margin is not the only basis for market value.
The opposite is true.
This is because the different reserve ratios introduce a skewing effect the average is 35% but ranges from 7% to 77% in this sample group.
By including resource ounces, which also have value, we smooth the results.
I have tried different resource and reserve weightings to reflect their relative low-high value but failed to make a better trend than for straight total resource and reserves number.
Companies usually forecast AISC at least 1 year a standard money for gold as, but sometimes for up to 3 years.
NAV is a calculation of all discounted future production, resource, assets, debt, cash, gold in hand etc.
Gold miners usually trade at NAV multiples between 1.
It is difficult to compare NAV multiples because calculations must use the same gold price forecast, visit web page price and exchange rates, plus consider tax issues across multiple jurisdictions.
To do this routinely for the whole market is practically impossible without a large team of analysts.
Even so, huge assumptions about long term mine plans have to be done with little or no data.
So again, it is a trade off between what is achievable and what is accurate.
Finally, there will always be investor taste or fashion.
What the market admires in a gold company today may not be what it admires tomorrow.
Some observations Time, gold price and sentiment If a gold company has the same margin at two points in time, should we expect the same market value?
We could explain this as lag, ie.
At first this seemed strange because I thought the 2016 Rally inflated prices by any measure.
But logically, companies that are more likely to dip back to skinny margins will be discounted relative to source with larger buffers.
This maybe a temporary phenomenon.
Like any market comparable, multiple or benchmark, the results are not an answer, but a place to start asking questions.

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Royal Gold considers and categorizes an exploration stage property to be an “evaluation stage” property if mineralized material has been identified on the property but reserves have yet to be identified.


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Textural and structural siting of the gold, high-variance mineral assemblages, proportion of various gold host rocks, and relative element enrichments at high metamorphic grade can be accounted for by gold formation at greenschist facies conditions followed by progress of the deposit to high metamorphic grade (metamorphic model).


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Evaluation of gold deposits - Part 2: Results of a survey of estimation methodologies applied in the Eastern Goldfields of Western Australia.. simulated models in Sivas gold deposit, Turkey. In.


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Computer processing in the exploration and evaluation of the Angovia gold deposit. - Free Online Library
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Placer mining is the technique by which gold that has accumulated in a placer deposit is extracted. Placer deposits are composed of relatively loose material that makes tunneling difficult, and so most means of extracting it involve the use of water or dredging.


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While no evidence of UDC was observed in this tube, the internal deposit evaluation indicated that UDC would be a concern should contaminant ingress occur. This tube is in the region of the IAPWS Deposit Map for HRSG HP Evaporator tubes that indicates chemical cleaning is necessary.


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ORE DEPOSITS 101 - Part 10 - Exploration Process

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guidelines for the evaluation and reporting of MRMR for placer deposits. Placer deposits include several different types of commodities and a range of geological environments. The three deposit types discussed here; mineral sands, placer gold and alluvial diamonds, are considered to have specific technical issues that require specialized knowledge.


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When dealing with mineral rights of mining enterprises, Canada has itsa standard for mining companies to comply with when reporting on their reserves and resources.
See " " To make thing gold deposits volcanic and allow comparison in a glance, the website 'GoldMinerPulse': gives a fair overview of many Canadian Gold Mining Valuations.
There are also specific Valuation Reports for the companies reported on.
The list is not exhaustive, as a minor retribution is required to include the company and update the statistics on a daily basis.
Caution: this website has become subscription based as of Dec.
The symbol links to a GoldMinerPulse metal valuation report on the company.
The company's metal valuation report contains the full details on the MORE calculation and provides links back to the latest available NI 43-101 compliant disclosures.
This most likely gives a quite distorted view.
Resources require perseverance, time and a hefty sum of money before turning into mining reserves.
An environmental impact study and bankable feasibility study on the project economics are just a few major hurdles before the mining permit can be granted and more capital can be raised for starting mine construction eventually.
Large projects will benefit some economy of scale and will become profitable more quickly.
A limited total ore reserve of some geographically gold deposit evaluation mining concession may be prohibitive for the project to be viable, even when grades are high.
Ore grades can be low or when ore grades are just average, underground exploitation cost can be as high as to render profitability of the pit marginal.
Ore veins can be apart by tens or hundreds of meters.
This will require removal of considerable quantities of just waste rock.
Open pit mining is comparatively cheap in terms of cost per tonne.
Lower grades can therefore be gold deposit evaluation profitably.
The ore processing cost per tonne is flat.
As such the processing cost per ounce of precious metal is inversely proportional to the ore grade.
Open pit mining sometimes becomes profitable because of the secondary production.
When including secondary base metals in the evaluation, the grade metric used is the total ore value per tonne.
For reserve and resource evaluation purpose, the value of secondary metal deposits are often converted to the main metal equivalent.
So the total gold-equivalent reserve+resource estimate AuEq exceeds the MORE.
The percentage of gold in the AuEq varies, depending on gold deposit evaluation prices of the different metals.
The value of any copper-gold deposit has surged because of a strong copper rally.
In spite of a high gold price, the percentage of gold in the total AuEq has diminished.
The repartition between reserves proven and probable and resources measured, indicated or inferred justifies a.
GoldMinerPulse also provides a quantitative estimate on the.
Typical explorers are on a low gold deposit evaluation line sloping upward for better ore values.
https://tossy.info/gold/free-e-gold-money.html are on a similar line.
Explorers bridging the gap should be about to become junior producers, else they may be overpriced.
Producers left of the producer valuation line are either under priced or else there is some inherent risk that cannot be quantified easily.
Composite Score As many valuation criteria need being taken into account, it is tempting to test a composite score for a quick evaluation and ranking.
It is not a straightforward task to define a reliable composite score indicator.
This implies that the spreadsheet can no longer be maintained in see more current form.
It no longer has the competitive edge it had when it was conceived.
Moreover, get minted slots website has become subscription based as of Dec.
Apart from the largest price slide in decades, there also have been quite a few mergers and acquisitions since end 2012.
The composite score is calculated and a ranking for the mining stocks is added.
Enterprises can be sorted according to their ranking.
As such dividing by an average may yield a distorted measure which https://tossy.info/gold/4d-jackpot-gold-7th-prize-money.html highly favouring the gold majors with a rich reserve and resource base.
Economy of scale may highly differentiate between a 100 K oz deposit and a 500 K oz deposit.
To obtain here better measure, we compare the total ore contents on a logarithmic scale.
Furthermore, the results are scaled by the magnitude range of the set.
High ore values usually originate from underground mining.
Every category is valued differently.
Reserves %PP are valued roughly three times as high 0.
Within resources the %MI category is valued almost twice as high 0.
The four components are weighted to obtain a composite score that averages 1000 over the companies listed.
Weights are in a small table and can therefore be tuned easily without any modification to the formulas in the spreadsheet.
In spite of its lower weight, this conponent therefore has a gold deposit evaluation larger impact on the visit web page composite score.
It is too tempting to just follow a well designed evaluation scheme and to allocate capital accordingly.
Therefore some caveats: For an explorer, the working capital available is not listed.
Even if it were, you additionally need a reliable estimate on the capital expenditure requirement to turn the exploration concession into a working mine.
· Successfully leading the company through the various stages of development of the exploration concession: Environmental issues: Environmental Impact Study, Economics: Bankable Feasibility Study, eventual mining concession.
· Carefully consider the necessity of any partnership for development of the concession, choose a partner offering the synergy required, negotiate the partnership terms, · Good management for an explorer has not necessarily the skills required for operating a mine.
If no partnership has been concluded with a producer, sourcing in management staff with the appropriate skills will be necessary.
For junior producers there is no indication of any payment to royalty financing companies having upfront financed mine construction.
Sometimes hedges are concluded for any secondary metal streams, just in order to facilitate financing.
Bankers will attribute a higher net present value for future revenues if prices are fixed.
Political hazard : Mining is a business that cannot be delocalised.
From changes in taxation, over bribery and extortion to expropriation, depending on the stability of the political regime any of those are possible.
Those caveats cannot be quantified.
You just need to consider any of them for the list of companies of your preliminary choice.
Avoid drowning in data and do your own due diligence on just these miners.
Their information on ore content, grade and repartition of reserve and resource categories are taken from the latest available NI 43-101 document.
Are those data fully reliable?
There is at least the legal backing of a regulation that strictly determines the methodology for assays and separates reserve and resource categories, such that for example measured or indicated resources should not be included in inferred resources the category they used to belong to as to avoid double counting.
Note: The regulation on the NI 43-101 document was voted after thewhereby investors were led astray after assays had been salted with gold deposit evaluation particles.
Comparing this information to what can be found elsewhere for example on 24hgold, whatI am happily surprised by the completeness of the data and the freshness daily updates on market cap and commodity price dependent valuation data.
If a concession is 100 % owned by one gold explorer, you have only their data to rely on.
A NI 43-101 document will inspire more trust than any preliminary press release followed by cautionary statements that nobody really cares to read.
An exploration concession jointly owned by a number of mining or exploration companies, should report identically on the status of the resources and reserves they are exploring.
At least if there is any difference, this should only be due to the difference in the article source time frame of the reporting.
Just one illustration of a possible hazard: In the valuation report onon GoldMinerPulse, we find among exploration concessions Donlin Creek, which is jointly owned with Barrick Gold Mining ABX.
Novagold reports for Donlin Creek an impressive 19.
When checking the 2009 annual report of Barrick table at page 159we do find a similar resource estimate 21 million ounces on behalf of their 50% ownership.
Barrick on the contrary refers to Donlin Creek as resources only: Measured 300 K Oz, indicated 18,149 K Oz and inferred 2,625 K Oz.
Exploration work at Donlin Creek seems far from finished.
Barrick is now revising the feasibility study to include the possible use of natural gas abundantly available elsewhere in Alaska as the main energy source for operating the future mine.
Is Novagold overstating the quality, hence the value of their main asset or is Barrick purposely underestimating the quality of that same asset?
Whom do you believe?
Well: the requirements of NI 43-101 for identification of "reserves" are not get minted slots same as those of the SME USand reserves reported by Novagold in compliance with NI 43-101 may not qualify as "reserves" under SME standards as reported by Barrick.
How you do this.
Previous few postings have warned against betting on leverage when investing in gold mining stocks.
Miners occasionally outperform when gol.
In addition to here over 1,000 exhibitors, 3,500 investors and.
Short 2018 mining review Early last year we witnessed gold rallying rapidly to what was to be its 2018 high.
Till about mid May, the yell.
A gold rally would then consist in a gradual process of relati.
Previous few postings have warned against betting on leverage when investing in gold mining stocks.
Miners occasionally outperform when gol.
On April 12, the HUI i.

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Royal Gold considers and categorizes an exploration stage property to be an “evaluation stage” property if mineralized material has been identified on the property but reserves have yet to be identified.


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How do you measure the value of gold a gold deposit still in the ground in terms of a company that is mining or in production exploration stage? The starting premise is how we value advanced explorers and developers to target companies that are undervalued with respect to their peers and evaluate how viable they’re as stakeholders.


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Formation of gold deposits: Review and evaluation of the continuum model | Request PDF
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GOLD MINING GEOLOGY !!! What To Look For . ask Jeff Williams

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Gold Deposits. Homestake Mine, located in western South Dakota, was created in 1876. Since the first production in 1878, almost 28 million troy ounces of gold have been extracted, worth 987 million dollars at present price causing the mine to be the most valuable in the United States.


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Amazing New High Grade Gold, Silver & Copper Mineral Deposit Found!

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The gold fields of the Witwatersrand Basin in South Africa are, by a landslide, the largest single gold producing district in the world. It has produced some 2 billion ounces over a century of mining and at an average grade of 15 g/t Au with a current head grade of 6-10 g/t Au and they still have.


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Computer processing in the exploration and evaluation of the Angovia gold deposit.
Computer processing in the exploration and evaluation of the Angovia gold deposit.
Retrieved Jun 15 2019 from In 1983 BRGM took out an Exploration License over the YaourC Massif in Cite d'Ivoire and in 1987 discovered the Angovia gold deposit, which included 3.
The deposit is now being developed by SEREM La Source Compagnie Miniare and GATRO GENCOR.
GDM, an applied geology software package developed and marketed by BRGM, was used from the very first stages of exploration to process the geochemical survey results and produce anomaly maps.
GDM was then get minted slots in the field during the evaluation phase 1990-1993 for processing the trenching and drilling results and estimating reserves.
The use of the GDM software package resulted in significant improvements in productivity, the quality of information, and lower exploration costs.
Geology Located 30 km west of Yamoussoukro, volcano-sedimentary deposits of the Upper Birimian series Early Proterozoic host the Angovia deposit.
The mineralization of the Angovia deposit non-visible gold + pyrite and rare chalcopyrite is related to hydrothermal alteration associated with the final stages of the volcano-plutonic complex.
It developed along sheeted dykes and an anastomosing fracture network where the hydrothermal fluids locally brecciated the country rock.
A hardpan laterite profile that developed over the deposit during the Cenozoic has since been notched by erosion.
History of the Discovery The discovery of the Angovia deposit resulted from an exploration strategy developed from all BRGM's West African experience.
Initially, this involved a study of the local history and the literature because gold panning is a traditional activity of the Baule population in central Cite d'Ivoire.
Gold has been obtained from alluvial and eluvial deposits in the YaourC region for centuries; the region had attracted European prospectors from the early part of the 20th century until the outbreak of the Second World War in 1939.
Reconnaissance geochemical soil sampling get minted slots a gold anomaly oblique to the known Angovia lode and open to the northeast.
This was attributed to disseminated ore within a stockwork, which gold aeroflot bonus card not correspond to the exploration target of the time, i.
No further exploration was carried out.
It was not until 1987 that regional exploration of the License area began.
Based on BRGM research into the metallogeny of the Birimian and the dispersion of gold under tropical climates, the exploration target was redefined as a shear-zone or stratabound type deposit containing fine gold.
Regional stream-sediment sampling at 1.
The data were processed using GDM and included digitization of the base map with gold deposit evaluation drainage pattern and sample locations, and statistical processing of the multi-element data to produce anomaly maps.
Between 1988 and 1993, work concentrated on confirming the resources of the deposit through trenching and core drilling.
In this way, decisions such as whether to stop or to extend certain boreholes or whether to relocate or reorient planned boreholes could be made before the rig was committed.
Estimation of Reserves Reserves source calculated using the standard polygonal method and geostatistical methods.
The polygonal method was based on 35 vertical get minted slots />The polygons of influence attributed to each borehole were delimited for different cut-off grades within the hydrothermal envelope ore-bodies CO to C5.
Calculations were restricted to a depth of 80 m below mastercard bonus gold />Figure 6 shows one of the sections prepared using GDM.
For the geostatistical evaluation, the borehole 136 cored boreholes and trench 46 trenches data were standardized using GDM to provide samples of constant length for the statistical and variographic analysis.
The geologist's interpretation of the vertical sections was used to define the envelopes of the orebodies and the boundaries of the three ore facies clay, oxide, and sulphide.
A 3-D model of the deposit geometry was then constructed on a 5 x 5 x 5 m grid by adding the topography.
The deposit was then estimated by kriging a model of 50 x 50 x 10-m blocks, taking into consideration the variogram models and the geometric model.
The use of Gold deposit evaluation in the field and the office from the very first phase of regional exploration to the calculation of reserves resulted in a significant gain in both volcanic gold deposits and quality, and thus a significant saving in costs.
All the data topographical, geological, and analytical and the geologist's interpretation were stored by GDM's data management system to provide a coherent database defined by the geologist at the beginning of the work and updated as and when necessary.
They can thus be easily corrected.
Moreover, it permits the geologist to reorient his or her program on the basis of daily results.
A whole range of graphics can be produced by GDM, from simple printouts on a portable printer to large color maps on a plotter.
It also enables graphics to be integrated directly into a report text.
Bruno Tourliere and Jacques Bobillier are senior geologists with BRGM.
The BRGM Group is simultaneously the French Geological Survey, an exploration and mining company, an applied research organization, and a service company in the areas of water, environment, and geotechnical engineering.
The authors would like to thank La Source Compagnie Miniare and GENCOR for permission to publish data on the Angovia project.
No portion of this article cash express gold class slot machine be reproduced without the express written permission from the copyright holder.

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While no evidence of UDC was observed in this tube, the internal deposit evaluation indicated that UDC would be a concern should contaminant ingress occur. This tube is in the region of the IAPWS Deposit Map for HRSG HP Evaporator tubes that indicates chemical cleaning is necessary.


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Formation of gold deposits: Review and evaluation of the continuum model | Request PDF
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Using the Sydney real-estate metaphor, we would plot m2 values against distance from the sea.
We plot developers using Prefeasibility or Feasibility Study Life of Mine average AISC estimates.
Developers generally plot at lower values than miners with the same margin.
As they advance their studies and secure funding, values creep right to join the miners' value.
For example developer Gold Road having already secured funding is plotting with the miners.
The trend among developers is weak to absent, with value presumably controlled more by development stage.
Having only a small sample size is also a problem here.
Looking at the miners, an outlier on the low value side is Centerra Gold.
This is not surprising considering the ongoing friction with the Kyrgyz government who are part owner and host to their main asset Kumtor.
An outlier on the high value side is Detour Gold.
Detour is in the process of ramping up into a new mine plan that was released in early 2016.
Newmont is a higher value outlier.
Whether this means it is overvalued is not clear.
There may be an element of winner takes all, with large funds who are only interested in the biggest gold miners all piling into Newmont over Barrick.
However this effect is not consistent, as other companies with 50% reserves sit within or below the trend.
It is interesting that Newmont are one of the few who calculated AISC to the letter of the WGC guidelines Dundee Capital Markets, June 2016.
If they were to fudge the numbers a little more like everyone else, they would have get minted slots higher margin and gold deposit evaluation closer to the trend.
Improving the correlation Most obviously, margin gold deposit evaluation not the only basis for check this out value.
The opposite is true.
This is because the different reserve ratios introduce a skewing effect the average is 35% but ranges from 7% to 77% in this sample group.
By including resource ounces, which also have value, we smooth the results.
I have tried different resource and reserve weightings to reflect their relative low-high value but failed to make a better trend than for straight total resource and reserves number.
Companies usually forecast AISC at least 1 visit web page ahead, but sometimes for up to 3 years.
NAV is a calculation of all discounted future production, resource, assets, debt, cash, gold in hand etc.
Gold miners usually trade at NAV multiples gold deposit evaluation 1.
It is difficult to compare NAV multiples because calculations must use the same gold get minted slots forecast, oil price and exchange rates, plus consider tax issues across multiple jurisdictions.
To do this routinely for the whole market is practically impossible without a large team of analysts.
Even so, huge assumptions about long term mine plans have to be done with little or no data.
So again, it is a trade off between what is achievable and what is accurate.
Finally, gold deposit evaluation will always be investor taste or fashion.
What the market admires in a gold company today may not be what it admires tomorrow.
Some observations Time, gold price and sentiment If a gold company has the same margin at two points in time, should we expect the same market value?
We could explain this as lag, ie.
At first this seemed strange because I thought the 2016 Rally inflated prices by any measure.
But logically, companies that are more likely to dip back to skinny margins will be discounted relative to read article with larger buffers.
This maybe a temporary phenomenon.
Like any market comparable, multiple or benchmark, the results are not an answer, but a place to start asking questions.