Annual report of the State Mine Inspector.

Title varies slightly.

Annual Report of the State Mine Inspector

Mode of access: Internet.

Report of the State Mine Inspector

Mode of access: Internet.

A Preliminary Study of the Separation of the Copper Sulfides from Sphalerite and the Effect of Certain Reagents on Some of the Pure Copper Minerals in Synthetic Mixtures

The problem of separating the copper sulfide minerals from sphalerite, in copper - zinc ores, has been a difficult one. This is largely due to the lack of adequate research and the small amount of data obtainable on the behavior of copper and zinc sulfide minerals in flotation circuits.

Annual report by the State Inspector of Mines to the Governor of the State of New Mexico

Title varies slightly

Annual report.

Some volumes have also distinctive title.

Report

Mode of access: Internet.

Annual report.

Reports for 1883-1884, 1886 include the Proceedings of the National Convention of Chiefs and Commissioners of State Bureaus of Statistics of Labor (form of name varies slightly)

Report

Report year ends June 30

Report

Reports for 1886/87-1888/89 Are Found In the 9th To 11th Annual Report of the Bureau of Labor Statistics; the Report for 1889/90, Printed Separately, Was Issued as V.2 of the 12th Annual Report (Missouri. Bureau of Labor Statistics)

Preliminary evaluation of acid mine drainage in Minas Gerais State, Brazil

Mining in the State of Minas Gerais-Brazil is one of the activities with the strongest impact on the environment, in spite of its economical importance. Amongst mining activities, acid drainage poses a serious environmental problem due to its widespread practice in gold-extracting areas. It originates from metal-sulfide oxidation, which causes water acidification, increasing the risk of toxic element mobilization and water resource pollution. This research aimed to evaluate the acid drainage problem in Minas Gerais State. The study began with a bibliographic survey at FEAM (Environment Foundation of Minas Gerais State) to identify mining sites where sulfides occur. Substrate samples were collected from these sites to determine AP (acidity potential) and NP (neutralization potential). The AP was evaluated by the procedure of the total sulfide content and by oxygen peroxide oxidation, followed by acidity titration. The NP was evaluated by the calcium carbonate equivalent. Petrographic thin sections were also mounted and described with a special view to sulfides and carbonates. Based on the chemical analysis, the acid-base accounting (ABA) was determined by the difference of AP and NP, and the acid drainage potential obtained by the ABA value and the total volume of material at each site. Results allowed the identification of substrates with potential to generate acid drainage in Minas Gerais state. Altogether these activities represent a potential to produce between 3.1 to 10.4 billions of m³ of water at pH 2 or 31.4 to 103.7 billions of m³ of water at pH 3. This, in turn, would imply in costs of US$ 7.8 to 25.9 millions to neutralize the acidity with commercial limestone. These figures are probably underestimated because some mines were not surveyed, whereas, in other cases, surface samples may not represent reality. A more reliable state-wide evaluation of the acid drainage potential would require further studies, including a larger number of samples. Such investigations should consider other mining operations beyond the scope of this study as well as the kinetics of the acid generation by simulated weathering procedures.

Mine subsidence at the District 11 State Police Headquarters in Maryville, Illinois : progress report [May 12 to September 9, 1980] /

"Funding provided through cooperative agreement with Region III, Office of Surface Mining, U.S. Department of Interior."

Mine subsidence at the District 11 State Police Headquarters in Maryville, Illinois : progress report September 10, 1980 to March 31, 1981 /

Prepared for Illinois Abandoned Mined Lands Reclamation Council.

Alabama as it is: or, The immigrant's and capitalist's guide book to Alabama. Furnishing the most accurate and detailed information concerning the varied elements of wealth in Alabama, whether of mine, field or forest, together with carefully prepared maps and charts illustrative of the numerous advantages possessed by the state.

Published by the state Department of agriculture.

A numerical study of steady state evaporative conditions applied to mine tailings

The suction profile of a desiccating soil is dependent on the water table depth, the soil-water retention characteristics, and the climatic conditions. In this paper, an unsaturated flow model, which simulates both liquid and vapour flow, was used to investigate the effects of varying the water table depth and the evaporation rate on the evaporative fluxes from a desiccating tailings deposit under steady-state conditions. Results obtained showed that at a critical evaporation rate, beyond which evaporation is no longer dictated by climatic conditions, the matric suction profiles remain basically unchanged. The critical evaporation rate varies inversely with the water table depth. It is associated with the maximum evaporative flux that might be extracted from a soil at steady-state conditions. The time required to establish steady-state conditions is directly proportional to the water table depth, and it acquires a maximum value at the critical evaporation rate. A detailed investigation of the movement of the drying front demonstrated the significance of attaining a matric suction of about 3000 kPa on the contribution to flow in the vapour phase.