Placer mining tool
US4031973A · kind A · utility
Inventors
Key dates
| Filing date | Nov 10, 1975 |
| Grant date | Jun 28, 1977 |
| Priority date | — |
| Expiry date | Nov 10, 1995 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B11/005
- WIPO fieldCivil engineering
- WIPO sectorOther fields
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.