Geochemistry · Queensland
Queensland Rock chips
Queensland rock chips tested for gold, coloured by how much each one held.
What it shows
Rock chips from Queensland, coloured by how much gold each one held: low (background, under 10 ppb of gold), anomalous (10 to 100 ppb), high (100 to 1000 ppb), or bonanza (1000 ppb and over). Those cutoffs are in parts per billion (ppb), where 1000 ppb is about one gram of gold in a tonne of rock. Each point is a spot where a chip of rock was taken off an outcrop and tested for gold by the Geological Survey of Queensland. A rock chip tests the rock itself rather than the soil sitting over it, so a high reading means gold is in the rock at that exact spot rather than washed in from somewhere else. That makes rock chips the most direct surface pointer to a reef.
Putting this on your map
Taking a layer from the Library onto a stack, and tuning how it draws, is a short guided tour on your own map.
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