Abstract

Geochemical anomaly separation using the concentration-area (C-A) method at Bardaskan area, NE Iran, is studied in this paper. Lithogeochemical data sets were used in this geochemical survey which was conducted for the exploration for Au and Cu mineralization in Bardaskan area. There are two main mineralization concluded epithermal gold mineralization and a disseminated system. Anomalous thresholds values for the mineralized zone were computed based on the data obtained from chemical analysis of samples for the lithological units. Several anomalies at local scale were identified for Au (13 ppb), Cu (40 ppm), Ag (2.3 ppm), As (4 ppm) and Fe (6920 ppm) the obtained results suggests existence of local Au and Cu anomalies whose magnitude generally is above 630 ppb and 5000 ppm, respectively. The most important mineralization events are responsible for presence of Au and Cu at grades above 631 ppb and 5012 ppm. The study shows threshold values for Au and Cu are being a consequence of the occurrence of anomalous accumulations of silicification and phyllic alterations metamorphic rocks especially in tuffaceous sandstones and sericite schist types. The obtained results were compared with fault distribution patterns reveals a positive direct correlation between mineralization in anomalous areas and the faults present in the mineralized system.

Abstract

Beneficiation studies were carried out on the Talashil beach placer sample of South Maharastra Coast, India. The sample contains magnetite, ilmenite, rutile, hematite, goethite and chromite as opaque minerals in the sample. The total heavy minerals fraction reaches 53.8 % by weight whereas the total magnetic minerals are 56.9%. It is observed that the 2^nd stage DHIMS magnetic fraction contains 65.2 % Fe 2 O 3 with an over all yield of 37.8 % and a 86 % recovery from a containing 26.8 % Fe 2 O 3 feed. This product can be used in the pellet feed for steel making after suitable blending with high-grade iron ore fines.

Abstract

The mines pollute the environment through the mining activity itself, which assembles metals on the site, through the discharge of untreated wastewater from the extraction and production process, through the railways tracks that moved the minerals down the mountain and along the shore, and as a result of the runoff from the huge mineral – rich stockpiles of residues that remain at the sites. At the Albanian side near to the Lake Ohrid, there are 10 mines and one enrichment plant [5].
Thus, to ensure consistent high quality, the water quality should be monitored. Chemical analyses for the metals Fe, Ni, Co, Cu and Cr were done on the mineral residuals from the mining activity, the surface waters and streams running through the mine sites. All of these chemical elements can reach the lake through rainwater and runoff, through surface water and groundwater discharge to the lake, and through the air [9]. Analysis of the residues themselves showed that they still contained significant amounts of the target minerals. The high concentrations measured in the residues, the streams running through the mining areas, have occurred because the residue piles were exposed on the ground at these sites.