Amidst the general fall in metal prices over the last few years, the gold price has remained comparatively stable in the US1,000-1,250o range. Gold bulls were disappointed that the price did not break through the 2,000o ceiling nevertheless the current stable price run has helped to maintain a strong interest in gold projects.Get A Quote
Gold processing has a couple of unique features. The first is the sheer variety of the mineralogical characteristics and associations, which is what this article is mainly about.
Metallurgical processing of metalliferous ores in general and gold ores in particular, consists essentially of three stages, often colloquially referred to as.
Prospecting and exploration that is a search for precious metals deposits is not a simple process because big deposits were discovered a long time ago. There are several places with important content of precious metals waiting for skill prospectors. The large mining companies of the world are focused in big deposits and the small deposits are attractive for small miners and perhaps their interest for gold is the most valuable tool for exploring new deposits.
Gold is a very widely disseminated throughout nature and may be found in any geological formation from the oldest rocks to the deposits that are still being formed, but in common with other metals, it is more likely to be found in the oldest rocks and in those places where the earth crust has undergone the most extensive changes such as elevations, folding, tilting, faults, fissuring and also volcanic action, with resulting changes in the composition and texture of the rocks.
In general, photogeology involves the interpretation of an areas geology from analysis of landforms, drainage and vegetation. Basically, there are four types of information, fracture and trace analysis, fracture identification, seep detection and channel change study. When a fracture is observed in cross section, it seems to be vertical or near vertical breaks in the bedrock. Gold particles can be deposited into fractures. Other important information is the called lithological mapping, which involves the interpretation of surface features so that can be obtained a more exact map.
Photographic surveys follow specified flight routes and take the photographs at regular spacing along the path. The overlap between adjoining photos in a sequence along the line is about 55-60. The overlapped area is detected by the camera from two different views in two different photos. The two adjoining photos used together make what are called a stereo pair. The two photos can be placed side by side and observed with a stereoscope.
Surface seismic techniques used in gold exploration are restricted to seismic refraction and seismic reflection methods. Probably, the first one is the most employed. The equipment employed for both techniques is very similar and assure the travel time of acoustic waves propagating through the subsurface. In the seismic refraction method, the travel time of waves refracted along an acoustic interface is measured. In the other technique, the travel time of a wave which reflects off an interface is measured.
Placer mining is usually aimed at removing gold from stream sediments and floodplains. Because placer mining often occurs within a streambed, it is an environmentally-destructive type of mining, releasing large quantities of sediment that can impact surface water for several miles downstream.
The information obtained can be used to make a map on bedrock topography, determine the depth of gravel or sand, delineate perched water tables, detect subsurface caverns, identify shallow faults and fracture ones, and detect large boulders.
Seismograph received data on waves travelling through different rock types.
It is essential in the evaluation of a gold deposit to have, as accurately as possible, a model of the mineralied one geometry, shape, sie, quality, variability, and limits. Physical, chemical and geological characteristics may vary greatly within a single deposit and from deposit to deposit. Critical data can be collected in a variety of ways, including drilling, surface andor underground mapping, geophysical or geochemical surveys, or studies of rock mechanics properties, mineralogical types and relations.
Other points to be sampled are stream sediment. These samples have to be collected in different stations along each drainage and theirs positions can be determined by using a GPS. Results of the survey provide information on potential areas of anomalous base and precious metal values throughout the place. By performing statistical analysis is possible to know what one or ones are more important and basically the gold and silver distribution.
Jun 19, 2019nbsp018332The VanEck Gold Miners GDX is the most widely followed gold mining ETF. This ETF has 46 holdings, an expense ratio of 0.53, and an average volume of 23.4 million.
Gold mining is arguably one of the most misunderstood industries in the field of investing. Many investors lack a basic understanding of how gold is produced and have unrealistic expectations about how long it actually takes. They are confused when mining.
Jul 11, 2015nbsp018332Discover current, past, and potential mining activity around the globe on The Diggingsthe largest free online resource of mining activity. We combine mining deposit data with Bureau of Land Management BLM claim listings to compare where known deposits of gold, silver, copper, and other mineable resources are located alongside where mining activity is and is not.
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