While other nations are pouring more money than ever into scientific drilling projects that reach deep into the earth's crust, researchers at the deepest scientific drillhole
in the United States, located near the San Andreas fault, are packing up their instruments.
- 4 metres (m) at 420 g/t gold, 170 g/t silver from 67 m down hole, within 17.7 m at 100 g/t gold in drillhole
After the geological model is completed from drillhole
information, cross-section and volume calculations may be made.
In the past this layer, normally covered by 2 kilometers of upper crust, had escaped the reach of even the longest drillhole
in the ocean.
Normally, this lubricant, which is used to remove cuttings from the drillhole
, circulates through the drillhole
Four close-spaced drill holes have been completed to define the extent of the quartz roscoelite bonanza gold zone within the BZ Zone at Mt Kare, around drillhole