Aggregate Materials in the San Francisco-Monterey Bay Area
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VAN VLECK GEORGE DEUKMEJIAN RANDALL M. WARD SECRETARY FOR RESOURCES GOVERNOR DIRECTOR DIVISION OF MINES AND GEOLOGY JAMES F. DAVIS STATE GEOLOGIST SPECIAL REPORT 146 MINERAL LAND CLASSIFICATION: AGGREGATE MATERIALS IN THE SAN FRANCISCO - MONTEREY BAY AREA Part II Classification of Aggegate Resource Areas South San Francisco Bay Production-Consumption Region By Melvin C. Stinson Michael W. Manson and John J. Plappert Assisted by Edward J. Bortugno E. Levis Russell V. Miller Ralph V . Loyd Michael A. Silva Under the Direction of James F. Davis, Rudolph G. Strand, and David J. Beeby 1987 CALIFORNIA DEPARTMENT OF CONSERVATION DIVISION OF MINES AND GEOLOGY 1416 Ninth Street, Room 1341 Sacramento, CA 95814 FOREWORD Special Report 146, "Mineral Land Classification of the San Francisco-Monterey 8ay Area," is the first analysis of mineral resources in the San Francisco-Monterey 8ay area to be developed by the Division of Mines and Geology under authority of the Surface Mining and Reclamation Act of 1975 (SMARA). This classification is provided to the State Mining and Geology 80ard for transmittal to the local governments which regulate land use in this region, and for consideration of areas, if any, to be designated as regionally significant. SMARA was enacted by the State Legislature to assure mineral resource conservation and adequate mined land reclamation. The Mining and Geology 80ard adopted Guidelines in June 1978 to be employed by the Division in its mineral resource classification. This report was prepared in conformance with those directives. The undertaking is of great importance in economic geology, because it deals with very specific mineral resource conservation issues in areas of intensive competing land use. James F. Davis State Geologist iii PREFACE Data presented in this report is accurate as of January 1983, at which time a preprint version of the report was circulated to lead agencies and made available to the public. Changes in reserves resulting from either the premature closure of mines active in 1983, or the permitting of new mines since that time, may have impacted forecasted depletion dates for the three production-consumption regions studied. However, the material presented and the fundamental conclusions of the report remain valid and useful. David J. Beeby Urban SMARA Program Manager v CONTENTS FOREWORD .•..••.•..............••..•••••.••.................••••••.••.••...................•.••..•..••.••.••.•••.•...................•••...••.•••.••....••...........••.•••••.... iii PREFACE •••..••••••••••••..••......•••.•••••••......••••••••.......•••••••••••........•••••••••..••.•...•.•••••••••••..••.••.••..•.......•.•••••••.••••••.•••••••••••••...•.•••••••. v EXECUTIVE SUMMARY (PART II) .••..•..•..................••..•..•..••..................•..••.••..•..••.••..•............••.••..•..••....................•..•..•..... xi INTRODUCTION •••••.••.••••••••.•......••••.••.••..•..•••••.••..•..••.••..••.•..••.••..•...•.•......•..•••.••.•••.••.•..•...............•......••............................. 1 ESTABLISHMENT OF MINERAL RESOURCE ZONES ....••..••.••.•••.•..••.•.........•..•...••.••..••..................•••.•..................•..•......... 2 Areas Classified MRZ-1 •••.•...••.••.••.••..•..••.•............•...•.•••.••..•.......................•.....................•.•.......................•............. 2 Areas Classified MRZ-2 ••.•••••..•..••.••.••.••••.•.•..........•.....••.••.••...............••..••.••..................••..•........................•.............. 2 Areas Classified MRZ-3 ........••.••..••............................•..••.••...........•.....................................•..............•...••.••.••.••.•...... 4 Areas Classified.MRZ-4 ..............••.••..•..•........•......•••.•..................•......••.••..•................•..•............................•..••......... 7 EVALUATION OF AGGREGATE RESOURCES IN THE SOUTH SAN FRANCISCO BAY P-C REGION .•.••...•.•..••.••..•...........•.••..•..................••.••..•..•.............•.....••..••.•...................•......•..•............•..•..••............. 7 Data Base •...........••..•..•..••.••...........•.••..•..••..•........•..••..••.••.••............•...•..••.•...•..•...................•.........................•..•........ 7 Factors Considered in Calculation of Resources ....••..•..••.••...........•.•.••.••..•....................•.••...................•................... 7 ESTIMATED AGGREGATE RESOURCES OF THE SOUTH SAN FRANCISCO BAY P-C REGION ............••.•..•..•........••.••.••......................•..•...................••.••...•......................••.••..........•....•..•••.•................ 12 Sand and Gravel Resources ..•.••.••..•.............•.••.••..•..••.•..........•.•••.•..•••.••.••..•......••..•••••.•••.••..•.........•.....••..•.•............... 12 Crushed Stone Resources ....•..•••.•..................•..•...•..••...........••..••.••..•..•................••.••.•••.••.••............••.••..•..•................ 22 Resource Sectors Outside of the Urbanizing Areas •...........••..••.•...•..•..•................••.••................•..•...•...................•• 34 Resource Sectors Within Parks ••.••..........•.••..••.••.....•................ ...•..•..................................................................•....•.