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Gold Prospecting
Metal Detecting for Gold
Do big Nuggets travel further from the source than small nuggets
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<blockquote data-quote="geof_junk" data-source="post: 672831" data-attributes="member: 1759"><p><em><span style="font-size: 18px">This is from an old doc. that I collected years ago.</span></em></p><p></p><p><span style="color: rgb(85, 57, 130)"><strong>1. RESIDUAL PLACERS</strong></span></p><p>A residual placer is, in effect, a concentration of gold (or other heavy</p><p>mineral) at or near its point of release from the parent rock. In this type of</p><p>placer the enrichment results from the elimination of valueless material</p><p>rather than from concentration of values brought in from an outside source.</p><p>Residual placers may be rich but they are not likely to be large and as a</p><p>class, they have been relatively unimportant. The "seam diggings" in EI</p><p>Dorado County, Calif., (Clark and Carlson, 1956, p. 435) offer an example</p><p>of residual gold placers.</p><p><strong><span style="color: rgb(85, 57, 130)">2. ELUVIAL PLACERS</span></strong></p><p>Eluvial placers usually represent a transitional stage between a residual</p><p>placer and a stream placer. Where one type merges into another, they cannot</p><p>be clearly distinguished. They are characteristically found in the form of</p><p>irregular sheets of surface detritus and soil mantling a hillside below a vein</p><p>or other source of valuable mineral. It should be noted that the parent vein</p><p>or lode may or may not outcrop at the actual ground surface. Eluvial placers</p><p>differ from residual placers in that surface creep slowly moves the gold and</p><p>weathered detritus down hill, allowing the lighter portions to be removed by</p><p>rain wash and wind. As the detrital mass gravitates downhill, a rough</p><p>stratification or concentration of values may develop but this is rarely</p><p>perfected to the degree found in stream placers. Eluvial placers are typically</p><p>limited in extent but there have been cases such as at Round Mountain,</p><p>Nevada, (Vanderburg, 1 936, pp. 1 33-(45) where this type of placer</p><p>supported large-scale mining operations.</p></blockquote><p></p>
[QUOTE="geof_junk, post: 672831, member: 1759"] [I][SIZE=5]This is from an old doc. that I collected years ago.[/SIZE][/I] [COLOR=rgb(85, 57, 130)][B]1. RESIDUAL PLACERS[/B][/COLOR] A residual placer is, in effect, a concentration of gold (or other heavy mineral) at or near its point of release from the parent rock. In this type of placer the enrichment results from the elimination of valueless material rather than from concentration of values brought in from an outside source. Residual placers may be rich but they are not likely to be large and as a class, they have been relatively unimportant. The "seam diggings" in EI Dorado County, Calif., (Clark and Carlson, 1956, p. 435) offer an example of residual gold placers. [B][COLOR=rgb(85, 57, 130)]2. ELUVIAL PLACERS[/COLOR][/B] Eluvial placers usually represent a transitional stage between a residual placer and a stream placer. Where one type merges into another, they cannot be clearly distinguished. They are characteristically found in the form of irregular sheets of surface detritus and soil mantling a hillside below a vein or other source of valuable mineral. It should be noted that the parent vein or lode may or may not outcrop at the actual ground surface. Eluvial placers differ from residual placers in that surface creep slowly moves the gold and weathered detritus down hill, allowing the lighter portions to be removed by rain wash and wind. As the detrital mass gravitates downhill, a rough stratification or concentration of values may develop but this is rarely perfected to the degree found in stream placers. Eluvial placers are typically limited in extent but there have been cases such as at Round Mountain, Nevada, (Vanderburg, 1 936, pp. 1 33-(45) where this type of placer supported large-scale mining operations. [/QUOTE]
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Gold Prospecting
Metal Detecting for Gold
Do big Nuggets travel further from the source than small nuggets
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