Mineral Class

State Mineral Classifications. The State Geologist classifies mineral lands solely on the basis of geologic factors. Existing land-use, by statute, is not considered. Classification of an area as a Mineral Resource Zone-2 (MRZ-2) indicates the existence of a deposit that meets certain criteria for value and marketability. The classification report also describes other categories of mineral resource zone -- MRZ-1, 3, and 4. The first two of these catefories are used to indicate if an area contains no resources (MRZ-1) or contains potential but presently unproven resources (MRZ-3). Areas where it is not possible to assign any of these categories are classified MRZ-4. (State of California Department of Conservation Mining and Geology Board Annual Report 1986)State mineral classification polygons. The State Geologist classifies mineral lands solely on the basis of geologic factors. Existing land-use, by statute, is not considered. Attributes: MRZ-1 = Area contains no resources. MRZ-2 = Existence of a deposit that meets certain criteria for value and marketability. MRZ-3 = Area contains potential but presently unproven resources. MRZ-4 = Area where it is not possible to assign any of the above catagories.Suffixes (a,b,c,d,e) to these attributes refer to specific area descriptions found in California Deparment of Conservation Division of Mines and Geology's SPECIAL REPORT 146-Mineral Land Classification: Aggregate Materials in the San Francisco - Monterey Bay Area.