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Dominy S.C.,Snowden Mining Industry Consultants Pty Ltd | Dominy S.C.,Curtin University Australia | Dominy S.C.,University of Ballarat | Platten I.M.,Snowden Mining Industry Consultants Inc | And 2 more authors.
Transactions of the Institutions of Mining and Metallurgy, Section B: Applied Earth Science | Year: 2010

Grade control programmes aim to deliver economic tonnes to the mill via accurate definition of ore and waste. The foundation of successful grade control is high quality sampling supported by geology and a suitable data management and modelling system. For underground operations sampling methods include chip, channel and panel samples, grab/muck pile samples, and drillbased samples. Grade control strategy is related to mining method and orebody type. Protocols must be designed to suit the style of mineralisation in question. Holistic studies focusing on ore mineralogy and gold particle deportment, size and distribution are required for sample collection and preparation protocol optimisation through 'Theory of Sampling' application. Where possible, characterisation programmes should be undertaken early in the life of a project. Appropriate assaying procedures are also required. Programme implementation will require suitably skilled individuals to train and mentor staff. On-going quality assurance/quality control monitoring and review will allow protocols and staff to be updated as required. A case study of protocol design from the Liphichi gold-antimony project in Bolivia is presented. © 2010 The Australasian Institute of Mining and Metallurgy. Source


Dominy S.C.,Snowden Mining Industry Consultants Pty Ltd | Dominy S.C.,Curtin University Australia | Dominy S.C.,University of Ballarat | Platten I.M.,Snowden Mining Industry Consultants Inc
Transactions of the Institutions of Mining and Metallurgy, Section B: Applied Earth Science | Year: 2012

At a recorded production of 2·5 t Au and mill recovered grade of 17 g/t Au, Clogau is the largest and richest mine in the Dolgellau gold-belt and is the most prolific gold producer in the United Kingdom. The main period of production commenced in 1861 and ended in 1911, with intermittent production between 1983 and 2007. The principal gold-quartz bearing Main reef can be traced for about 3 km along strike, trending approximately NE-SW and dipping between 60uSE and 90uSE. The reef system pinches and swells, changes strike, and splits into a number of major and minor branches. Reef width is variable, ranging from 6 m to a few centimetres. The reef is internally complex and composed of swarms of narrow sub-parallel quartz veins separated by sheets of country rock. The gold-bearing vein segments within the composite reef package are discontinuous, though may locally possess bonanza grades running at 1000s g/t Au. The predictability of the gold-rich segments is poor, but has been shown to be related to presence of the Clogau Formation (black-shale), interactions of the reef fault with greenstone sills, and/or reef splitting to form discrete ore shoots. © 2012 Institute of Materials, Minerals and Mining and The AusIMM. Source


Dominy S.C.,Snowden Mining Industry Consultants Pty Ltd | Dominy S.C.,Curtin University Australia | Dominy S.C.,University of Ballarat | Minnitt R.C.A.,University of Witwatersrand
8th International Mining Geology Conference 2011, Proceedings | Year: 2011

Grade control programs aim to deliver economic tonnes to the mill via accurate definition of ore and waste. The foundation of a successful program is high quality sampling supported by geology and a suitable data management and modelling system. Underground sampling methods include chip, channel and panel samples; grab/muck pile samples; and drill-based samples. Grade control strategy is related to mining method and orebody type. Sampling protocols must be designed to suit the style of mineralisation in question. Holistic studies focussing on ore mineralogy and gold particle deportment, size and distribution are required for sample collection and preparation protocol optimisation through 'Theory of Sampling' application. Where possible, such programs should be undertaken early in the life of a project. Appropriate assaying procedures are also required. Program implementation will require suitably skilled individuals to train and mentor staff, with ongoing Quality Assurance/Quality Control (QA/QC) monitoring and review will allow protocols and staff to be updated as required. Source


Dominy S.C.,Snowden Mining Industry Consultants Pty Ltd | Dominy S.C.,Curtin University Australia | Edgar W.B.,Castlemaine Goldfields Ltd
Australasian Institute of Mining and Metallurgy Publication Series | Year: 2012

High-nugget effect vein-gold systems are generally considered to be one of the most challenging of deposit types to evaluate and exploit. To potential investors and mining companies, they are viewed as high risk because of the associated uncertainties in the grade estimate and general paucity of Ore Reserves at production start-up. However, despite the well-known risks, these deposits often have a grade upside that makes them potentially attractive. The reporting of resource grade is of importance and perhaps even more so is the reporting of the associated uncertainty attached to the grade estimate. The use of the grade estimate supported by a grade range is recommended to achieve more complete and useful disclosure. The definition of the grade range can be somewhat subjective, ranging from opinion based estimates through to data-based estimates and geostatistical conditional simulation. Whichever method used, the over-riding issue must be the provision of enough data of appropriate quality and full disclosure to the public of relevant uncertainties. Source


Dominy S.C.,Snowden Mining Industry Consultants Pty Ltd | Dominy S.C.,Curtin University Australia | Dominy S.C.,University of Ballarat | Platten I.M.,Snowden Mining Industry Consultants Inc
Transactions of the Institutions of Mining and Metallurgy, Section B: Applied Earth Science | Year: 2012

Grade control is a process of maximising value and reducing risk. It requires the delivery of tonnes at an optimum grade to the mill, via the accurate definition of ore and waste. It essentially comprises data collection, integration and interpretation, local resource estimation, stope design, supervision of mining and stockpile management. The foundation of all grade control programmes should be that of geological understanding led by clear and accurate mapping and representative sampling to drive appropriate estimation strategies and mining. Gold veins show features relating to erratic grade distribution (nugget effect), and variable geometry and internal architecture. These features include variations in dip, strike and width, late-stage faulting/shearing effects and vein continuity and type. Variations generally require close geological understanding to ensure optimum grade, minimal dilution and maximum mining recovery. A welldesigned grade control programme will prove to management and stakeholders that by applying geological knowledge, the mining process can be both efficient and cost effective. © 2012 Institute of Materials, Minerals and Mining and The AusIMM. Source

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