silicification

“Extensive alterations of the country rock in the way of silicification and sericitization, and the presence of minerals like garnet, tourmaline, diopside, and others, known to be commonly deposited by the same hot solutions which make many ore deposits, may furnish a clue for exploration below.”

The Economic Aspect of Geology

“The chemistry of the process of petrifaction or silicification," writes”

The Book of the National Parks

“Previous drilling and a 2004 Gradient Array Resistivity geophysical survey indicate potential for identifying economic quantities of high-grade gold and silver mineralization in the Capgold epithermal system, as most of the gold and silver identified at Capgold to date has been found within large zones of silicification which are receptive to identification by resistivity measurement surveys.”

American Paramount Gold Complete’s Geophysical Survey at Capgold Project - Yahoo! Finance

“Smaller zones of silicification are associated with the margins of both breccia bodies.”

Big Bear Mining Announces Completion of Initial BG Project Drill Holes and Reports Positive Results From 2010 Rattlesnake Hills Exploration Surface & Drill Programs - Yahoo! Finance

“Mineralisation in the Tulkubash Zone is hosted in silicified quartzites and mineralised zones exhibiting pervasive silicification and some argillic alteration, together with elevated contents of sulphides at depth of up to 5%-10% of volume.”

Reuters: Press Release