During the last glacial period native gold was freed from the host rock and became available for placer mining.
22.
These ancient rocks are noted as host rocks for a variety of ore deposits in Australia, Namibia and Canada.
23.
Host rocks are typically submature to supermature, polymictic conglomerates and sandstones deposited in alluvial fan and braided stream environments.
24.
Basin rests above the Boulder Batholith, the host rock for many valuable mineral ores found in this part of Montana.
25.
At a later stage, some remobilisation took place, producing uranium mineralised veinlets in the host rocks of the coal seams.
26.
Nambulite is formed from the reaction between a hydrothermal solution and rhodonite, and commonly creates veins in the host rock.
27.
It is best known as the host rock for major deposits of tight oil ( shale oil ) and shale gas.
28.
Many lodes, particularly the lead lodes, have sharp contacts with gneissic host rocks, indicating they have become structurally relocated during peak metamorphism.
29.
The 51, 000-seat stadium, built on the southern edge of the Dutch capital, will also host rock concerts and other sporting events.
30.
Because of the competent host rock, this pit has much steeper sides than other open pit copper mines in the southwest area.
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