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Gold Prospecting
Gold Maps & Resources
Doug Stone, John Tully et al Maps - The Good, the Bad & the Alternatives
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<blockquote data-quote="user 4386" data-source="post: 651538" data-attributes="member: 4386"><p>One thing it is important to realise is that Geovic only shows deep alluvial gold mining shafts (mostly "deep lead" shafts). There are two reasons for this. The first is that most shallow alluvial leads were worked out within 3 years and many of the remainder 6 years of the discovery of gold in 1851 (so there was a small population, mostly busy digging or supplying diggers, not making maps). The second reason was that shallow alluvial claims were tiny (8x8 feet or 12x12 feet) so shafts were commonly close enough to do a long jump between them. So early maps simply indicate the areas of continuously worked leads by dots. MOST of these have since been bulldozed in etc, so there is not a lot to put on modern maps (although I find Lidar can often distinguish mounds where deeper of the shallow shafts existed). But to me that does not mean that knowing where we can still identify shafts now is any great advantage - the flattened areas are commonly just as good for detecting.</p><p></p><p>So it all depends on what you want to do (or think you want to do).</p></blockquote><p></p>
[QUOTE="user 4386, post: 651538, member: 4386"] One thing it is important to realise is that Geovic only shows deep alluvial gold mining shafts (mostly "deep lead" shafts). There are two reasons for this. The first is that most shallow alluvial leads were worked out within 3 years and many of the remainder 6 years of the discovery of gold in 1851 (so there was a small population, mostly busy digging or supplying diggers, not making maps). The second reason was that shallow alluvial claims were tiny (8x8 feet or 12x12 feet) so shafts were commonly close enough to do a long jump between them. So early maps simply indicate the areas of continuously worked leads by dots. MOST of these have since been bulldozed in etc, so there is not a lot to put on modern maps (although I find Lidar can often distinguish mounds where deeper of the shallow shafts existed). But to me that does not mean that knowing where we can still identify shafts now is any great advantage - the flattened areas are commonly just as good for detecting. So it all depends on what you want to do (or think you want to do). [/QUOTE]
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Gold Prospecting
Gold Maps & Resources
Doug Stone, John Tully et al Maps - The Good, the Bad & the Alternatives
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