Kushikino gold ores have been used in this research.
To make sure the State of existence of gold particles in ore, the author has made experiments on assaying and microscopic examination on the ore. Resuts are,
(1) Gold contents are little in white silica,
(2) In grayish black parts of the ore, mutch argentite is held and gold contents are higher
(3) About 77% of gold particles in the ore are of the size 52, 43kt and prevalent.
(4) Gold partticles held in Argentite are fouud.
(5) Degrees of liberation of the gold particles by grinding are only 26.4%.
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