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Pages for logged out editors learn more. Contributions; Talk; ... Following is a list of minerals that serve as copper ores in the copper mining process: [1] Image ...
Overburden is also used for all soil and ancillary material above the bedrock horizon in a given area. By analogy, overburden is also used to describe the soil and other material that lies above a specific geologic feature , such as a buried astrobleme , or above an unexcavated site of archeological interest.
The ore is Zn-rich at the top and Cu-rich at the base. Geometry Typically tabular to lensoid, and range from less than 1 to more than 150 million tonnes. They often occur in clusters. Economic minerals Chalcopyrite (Cu), sphalerite (Zn), galena (Pb), silver and gold.
Porphyry copper deposits represent an important resource and the dominant source of copper that is mined today to satisfy global demand. [6] Via compilation of geological data, it has been found that the majority of porphyry deposits are Phanerozoic in age and were emplaced at depths of approximately 1 to 6 kilometres with vertical thicknesses on average of 2 kilometres. [6]
Soapstone is relatively soft because of its high talc content—talc has a definitional value of 1 on the Mohs hardness scale. Softer grades may feel similar to soap when touched, hence the name. No fixed hardness is given for soapstone because the amount of talc it contains varies widely, from as little as 30% for architectural grades such as ...
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