Burns said the stone wasn't radioactive, but is an extremely rare rock known as rhyolite. Rhyolite is created by layers of cooling lava close to the Earth's surface. Only one other piece of ...

No gold is found at surface, though high levels of mercury in rock ... fluid flow, alteration, and low-grade mineralization indicates the potential for economic grades in a focused conduit. The AOI1.5 ...

Figure 2 - Oxidation and alteration in a rhyolite dike from borehole MH-04 Figure 3 - Strip log of MH-04 Once again, the rock types, structure and alteration patterns seen in MH-04 correspond well ...