Placer mining tool

Details Placer mining tool Placer mining tool

1975-11-10

1977-06-28

Purser, Ernest R.

Boring or penetrating the earth

With tool shaft detail

175 60, 175213, 175388, 299 9, E21B 4900

Patent

active

040319733

ABSTRACT:
This invention relates to placer mining and more particularly to a novel bit adapted for use in stream beds, dependably to break up and deliver to and through a sluice box a quantity of divided, water-borne gravel, sand, clay and ore for the conventional analysis and segregation of the precious metal or metals contained therein. There have been prior proposals of a generally similar nature but the material dislodging bits employed have been so poorly designed that they have been severely limited in capacity or have quickly become clogged by gravel, clay, etc. so that the ore digging operation has had to be frequently interrupted for the elimination of obstructing material. The present invention substantially eliminates this shortcoming.

REFERENCES:
patent: 203637 (1878-05-01), Mull
patent: 863700 (1907-08-01), Crosby
patent: 996450 (1911-06-01), Bouchet
patent: 1479894 (1924-01-01), Carey
patent: 1861632 (1932-06-01), Haynie
patent: 2057691 (1936-10-01), Ranney
patent: 2784944 (1957-03-01), Freeman
patent: 3144912 (1964-08-01), Boehm et al.
patent: 3995439 (1967-12-01), Hahlbrock

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