Revised grade and tonnage model of carbonatite deposits

Open-File Report 98-
235. - U.S. Geological Survey (USGS), 1998. 8 p. Первоисточник - сайт USGS http://www.usgs.gov
Исследована взаимосвязь содержания-масштаб оруденения месторождений в карбонатитах.
This model applies to the descriptive model of carbonatite deposits (No. 10) by Singer (1986a) and should replace the grade and tonnage model in that volume (Singer, 1986b). Data used in this model are presented in Table
1. In some cases, other estimates of grades or tonnages were available, but their quality was questionable and so they were not used here.