OBJECTIVES An excess of mesothelioma has been observed in iron ore miners in Northeastern Minnesota. Mining and processing of taconite iron ore generate exposures that include elongate mineral particles (EMPs) of amphibole and non-amphibole origin. We conducted a nested case-control study of mesothelioma in a cohort of 68,737 iron ore miners (haematite and taconite ore miners) to evaluate the a...

specific elements (cr, al, ca, and si) and loss on ignition (loi) were used for semi-quantitative determination of the normative mineralogical composition of naturally occurring chromium ores in ophiolite complexes. by far the occurring ore minerals are complex both from the mineralogical and chemical viewpoints. the secondary minerals serpentine and cr-containing chlorite (kaemmererite) form n...

Analyses for columbium in pyrochlore ores from North Bay, Ontario, have been made successfully by using o-ray fluorescence techniques. rt was necessary to use, as in methods of optical spectroscopy) an internal standard for this work. The choice of a suitable internal standard for a particular metal in a specific mineral association or ore-t).pe requires consideration of the characteristic r-ra...

The determination of the Ultimate Pit Limit (UPL) is the first step in the open pit mine planning process. In this stage that parts of the mineral deposit that are economic to mine are determined. There are several mathematical, heuristic and meta-heuristic algorithms to determine UPL. The optimization criterion in these algorithms is maximization of the total profit whilst satisfying...

Category 1 – General Domain This is a system in the geology domain. Main General Function PROSPECTOR is an expert system designed for decision-making problems in mineral exploration. It aids geologists in evaluating the favorability of an exploration site or region for occurrences of ore deposits of particular types. Once a site has been identified, PROSPECTOR can also be used for drilling-site...

The usage of inefficient techniques in artisanal gold mining is quite common, either to extract the ore or processing it, and related to environmental contamination. This paper analyse the mineral processing of a case study in Peru (San Cristobal) with the aim to improve the gold recovery process and the environmental impact. The process of amalgamation (gold-mercury) has been found as ineffect...

Purpose. Study on the processes contributing to formation of pyrite-polymetallic mineralization in Rudny Altai, development recommendations for directions further research. Methodology. Analysis literature and fund materials, field studies within known ore fields deposits, sampling laboratory studies: spectral analysis, chemical composition host rocks (ISP-MS Agilent 7500cx), study mineral main...

Specific elements (Cr, Al, Ca, and Si) and loss on ignition (LOI) were used for semi-quantitative determination of the normative mineralogical composition of naturally occurring chromium ores in ophiolite complexes. By far the occurring ore minerals are complex both from the mineralogical and chemical viewpoints. The secondary minerals serpentine and Cr-containing chlorite (kaemmererite) form n...

Tetrathionates have been found in significantly high concentrations recycled process waters from massive sulphide ore processing plants. These polythionates react with xanthate added to flotation pulps thus reducing dosages solution potentially affecting performance. The current study focused on the effect of tetrathionate-xanthate reaction mineral recoveries. Ore dissolution studies confirmed ...