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Thursday, July 29, 2010 7:43:12 PM
What to Look For
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Gold may occur as visible specks or nuggets in quartz veins. It can also occur in sulphides - pyrite (fools gold) where it would probably not be visible and would require an assay or analysis to determine its presence.
Gold and other elements are often associated with alteration, which is rock that has been changed by hot fluids from deep in the earth. The presence of alteration may be signaled by a change in rock color (i.e. from red to green or brown and then back to red again) over a short distance. The rock often becomes much harder, due to the addition of silica from the fluids and the altered zone often carries quartz and associated sulphides (such as pyrite or fools gold).
Sulphides oxidize or "rust" on the surface. Rusty zones then provide a clue to the presence of sulphides which may carry base metals or gold or both. Gold may be visible, as small specks, in these zones (such as many on the Baie Verte peninsula) or an assay or analysis may be required to detect the presence of base metals and/or gold. Oxidation or staining on the rocks suggests the presence of other elements such as copper (green, blue colors), nickel (green), cobalt (purple), and molybdenite or uranium (yellow). Most sulphides have a metallic lustre (i.e. look like metal) and can be identified by their crystal structure and color.
Gold may occur as visible specks or nuggets in quartz veins. It can also occur in sulphides - pyrite (fools gold) where it would probably not be visible and would require an assay or analysis to determine its presence.
Gold and other elements are often associated with alteration, which is rock that has been changed by hot fluids from deep in the earth. The presence of alteration may be signaled by a change in rock color (i.e. from red to green or brown and then back to red again) over a short distance. The rock often becomes much harder, due to the addition of silica from the fluids and the altered zone often carries quartz and associated sulphides (such as pyrite or fools gold).
Sulphides oxidize or "rust" on the surface. Rusty zones then provide a clue to the presence of sulphides which may carry base metals or gold or both. Gold may be visible, as small specks, in these zones (such as many on the Baie Verte peninsula) or an assay or analysis may be required to detect the presence of base metals and/or gold. Oxidation or staining on the rocks suggests the presence of other elements such as copper (green, blue colors), nickel (green), cobalt (purple), and molybdenite or uranium (yellow). Most sulphides have a metallic lustre (i.e. look like metal) and can be identified by their crystal structure
and color.
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