- 行业: Mining
- Number of terms: 33118
- Number of blossaries: 0
- Company Profile:
The U.S. Bureau of Mines (USBM) was the primary United States Government agency conducting scientific research and disseminating information on the extraction, processing, use, and conservation of mineral resources.
Founded on May 16, 1910, through the Organic Act (Public Law 179), USBM's missions ...
A sedimentary deposit consisting of chalcedony or of fine-grained quartz and variable amounts of hematite, magnetite, or limonite.
Industry:Mining
A sedimentary deposit in which the amount of clay exceeds that of sapropel.
Industry:Mining
A sedimentary deposit laid down in the brackish water of an estuary, characterized by fine-grained sediments (chiefly clay and silt) of marine and fluvial origin mixed with a high proportion of decomposed terrestrial organic matter; it is finer grained and of more uniform composition than a deltaic deposit.
Industry:Mining
A sedimentary deposit laid down in the sea, usually beyond the seaward edge of the littoral belt.
Industry:Mining
A sedimentary deposit laid down on land or in bodies of water not directly connected with the ocean, as opposed to a marine deposit; a glacial, fluvial, lacustrine, or eolian deposit formed in a nonmarine environment.
Industry:Mining
A sedimentary dike consisting of sand that has been squeezed or injected upward into a fissure.
Industry:Mining
A sedimentary dike formed by the filling of a fissure from above with sedimentary material.
Industry:Mining
A sedimentary rock composed of clay-grade particles; i.e., composed of minute mineral fragments and crystals less than 0.002 mm in diameter; containing much colloidal-size material. In addition to finely divided detrital matter, argillaceous rocks consist essentially of illite, montmorillonite, kaolinite, gibbsite, and diaspore.
Industry:Mining
A sedimentary rock composed of relatively coarse sand grains in a very fine silt or clay matrix.
Industry:Mining
