Generally, the industries can be reaggregated to the ISIC divisions. Although peat is similar to coal in that it can be used as a fuel, the extraction and beneficiating processes are distinctly different from coal and are similar to the processes involved with non metallic minerals. It should be noted that in North America peat is seldom used as fuel but rather as a soil conditioner. Gold mining and silver mining are separated at the national five digit level. Silver mining becomes a null set as it does not exist in Canada.
Silver is mined only as a by product of lead and zinc mining in Canada.
However these 4 digit industries are restored for national detail. However, CSIC 0821, Sand and Gravel Pits, is restored at the level of national detail. There are no known establishments primarily engaged in extracting clay in Canada, although extraction of clay exists by the manufacturers of clay products. Peat extraction is of little statistical significance in Mexico. Beneficiation of Other Nonferrous Metallic Ores, has been split out.