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Understanding Hard Rock Mining: Terms and Methods—Part II

A better understanding of hard rock mining methods and knowing a little about how these mines work can help the individual prospector to understand reports and stories about both modern and historic mine operations.

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VLF Detector Operating Modes


It is important to note that discrimination is a type of electronic filtering. The signal is analyzed, and depending on the discrimination setting, identified as either a target to be dug or a target to be ignored.

Mineralized Calderas in Colorado


A caldera is a large circular volcanic depression caused by collapse due to the removal of molten magma from an underlying magma chamber. The removal of magma is due to explosive venting of lava and pyroclastic material.

Company Notes


• Pure Gold Minerals Inc.
• International Freegold Mineral Development Inc.
• Hope Bay Gold Corp. Inc.

Update: Forest Service Interim Rule


On July 9, 2004, Under Secretary of the Department of Agriculture, Mark Rey, published the “Interim Rule.”  By its own terms, the Interim Rule became effective on August 9, 2004, without regard to public comments. Public comments were, however, received until September 7, 2004.

Miners Discuss Struggles at NWMA


Falling metal prices and rising production costs have squeezed profits in recent months, forcing many mine layoffs and putting some new mines on hold. Now, the industry is gearing up for another fight over mining reform legislation with a Congress that has fewer mining supporters after November’s elections that saw Democratic majorities increase in both houses.

Pocket Gold


Once a seam is found it can be traced for miles in either direction. While you are tracing a clay line, you are looking for indicators. The indicators that I look for are ironstone, hematite, different color clays intermingled with the clay line, and a very iron-rich, brown gritty soil.

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