Cadia Valley Operations Cadia Valley Operations
• Ridgeway underground mine producing 5.6Mtpa Ridgeway underground mine producing 5.6Mtpa Au/Cu ore Au/Cu ore
• Cadia Hill open pit mine producing Cadia Hill open pit mine producing +17Mtpa Au/Cu ore Au/Cu ore
• Ore processing complex treating Ore processing complex treating +22Mtpa ore 22Mtpa ore
• $900M in assets $900M in assets
• Full time employment of around 900 people Full time employment of around 900 people
• Forecast production current year +680koz Au & Forecast production current year +680koz Au & 
+80kt Cu +80kt Cu

The worksheet called Deposits contains descriptive information, and the original, compiled data on metal endowment of the deposits. The deposits worksheet can be viewed by clicking on the tab in the lower left-hand corner of this window called "deposits"

Porphyry-related metal deposits are large-tonnage, generally low-grade, hydrothermal deposits related to igneous intrusions emplaced at high crustal levels. Mineralization may be confined to pluton-hosted disseminations, stockworks, vein sets, and breccias and (or) occur in skarns, replacements, veins, and disseminated deposits peripheral to the inferred source pluton. Coeval epithermal precious metal-dominated deposits may occur above, or be telescoped onto, porphyry systems. This spectrum of deposit types includes many of the world's largest accumulations of Cu, Mo, Au, Ag, Sn, and W. As such the deposits represent critical economic resources and important exploration targets (Gilmour et al., 1995; Kirkham and Sinclair, 1996; Singer, 1995).

Welcome to our operations. You are visiting an extremely beautiful and remote area, home of many natural wonders, including an equatorial glacier, the Jayawijaya mountain range and majestic waterfalls. You are also touring one of the largest, most innovative and most exciting mining operations in the world. The Grasberg mine is located at an elevation of 13,000 feet. Average annual rainfall is about 200 inches …. so don’t forget your coat and umbrella! 
During your stay with us, we will conduct a Safety Orientation with you. We place the safety of our workers and visitors as a core aspect of our business -- and your safety is our highest priority. We ask your cooperation in observing our safety procedures. Personal safety equipment will be provided during the visit and you will be informed of our safety policies and procedures <...>

The Oyu Tolgoi copper-gold porphyry deposits arc located 6S0 kilometres south of Ulaan Baa tar in the south Gobi region of Mongolia. Copper mineralisation was first discovered in the Bronze age. During the late 1990’s extensive exploration including drilling was conducted by ВНР.

Малмыжская золото-меднопорфировая система (далее «Малмыж») была выявлена в 2005-2007 гг горнодобывающей компанией Phelps Dodge Corporation (США) на основе
анализа геологических отчетов советских и российских геологов и в результате проведенных затем полевых работ. Эта компания, являвшаяся в то время одним из крупнейших производителей меди в мире, через учрежденные ею российские дочерние предприятия проводила на Дальнем Востоке России поиски крупных золотомеднопорфировых и собственно золоторудных месторождений. Общее руководство работами осуществляли региональный менеджер по развитию новых проектов Мак Кэнби (Mac Canby) и главный геолог российского филиала компании А.Б. Волков. В 2008 компания, а с нею и Малмыжский проект, были приобретены компанией Freeport-McMoRanCopper&Gold Inc. (США), владеющей крупнейшим в мире золото-меднопорфировым месторождением Grasberg в Индонезии <...>

RMG 8th Annual Mining and Exploration Investment Conference 

Overview
• Trends in Exploration Expenditures
- Level of expenditure and key drivers
• Current “Hot Spots” for Exploration 
• Trend in Discovery Rates
- Metal found, Unit Discovery Costs for Au, Cu and U3O8
• Trends in conversion rates (from Discovery > Development)
- Not all discoveries get mined, and those that do may take many years
• Impact of changes in cut-off grade on available resources
- Resources can significantly grow with lower cut-off grades ...needs economies 
of scale, innovation in technology and higher prices to happen
• Are we finding enough metal ?
– Implications on long run commodity prices
• Conclusions

Проявление золоторудных гнезд в окварцованных зонах шахты Гвинфинидд: геологическое объяснение эффекта самородка

Gold-bearing quartz reefs commonly show extremely erratic and unpredictable grade variation, although gross geological continuity may be good. This type of variation is often described as being nuggety or having a high nugget effect and can be measured quantitatively using the semivariogram. Understanding of geological features such as reef texture and structure will provide improved models for the interpretation of assay data, drill core descriptions, etc.

The accepted practice for the estimation of thin (2D) vein deposits recommends the use of the grade x thickness service variable (i.e., the accumulation). Grade estimates are obtained indirectly by the estimated accumulation/estimated thickness ratio. This practice stems from the varying support (thickness) problem and the resulting non-additive nature of the grade variable. We compare the actual performance of the direct grade estimation approach used by some practitioners to that of the indirect approach using accumulation. Our simulated and real data indicate that the direct approach is more accurate for point grade estimation where the grade-thickness correlation coefficient is positive (and vice-versa). Moreover, the relative gain of the direct method increases with the (positive) correlation coefficient. This finding contradicts common thinking that the indirect approach should be the preferred method where grade-thickness correlation is strongly positive. Also, for a given positive grade-thickness correlation, the relative gain of the direct method increases with the coefficient of variation of the grade and thickness. 

In their paper, Marcotte and Boucher (2001) cast some new light on the old problem of 2D estimation of vein-type deposits with thickness and grade of intercepts. Using a theoretical approach, some extensive simulation experiments and the Walker Lake data, they show that the direct approach (interpolation of grade at points on a regular grid) gives better estimates of the true grade at those points than the indirect approach (interpolation of grade x thickness or accumulation and interpolation of thickness) when there is some positive correlation between grade and thickness and that this better performance increases with the correlation of grade and thickness as well as the variability of both variables. We would like to bring some reservations to that conclusion by showing that even if direct point grade estimates are better than indirect ones, it is not necessarily true for block estimates and in particular for the estimated grade of the whole orebody itself. <...>

Оценка минеральных ресурсов структурно-сложных и прерывающейся минерализации с применением нелинейной геостатистики: на примере изучения мезотермального золотого оруденения Северной Канады

An estimation of resources of structurally complex gold lodes and stockworks represents a challenging task for geoscientists due to the complex geometry of the lodes and discontinuous grade. In the present case study, the resource of a gold stockwork has been estimated by uniform conditioning after the lode has been subdivided into geostatistically defined domains using the indicator probability model.