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Mineral Resource Lands of Long-Term Commercial Significance Inventory Study Thurston County Planning Department Long Range Plann

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Mineral Resource Lands of Long-Term Commercial Significance Inventory Study Thurston County Planning Department Long Range Plann associated earth sciences incorporated Thurston County Mineral Lands Project - Geologic Inventory and Classification Study MINERAL RESOURCE LANDS OF LONG-TERM COMMERCIAL SIGNIFICANCE INVENTORY STUDY Prepared For: THURSTON COUNTY PLANNING DEPARTMENT LONG RANGE PLANNING SECTION August 30, 2017 Project No. 160529H002 Associated Earth Sciences, Inc. 911 5th Avenue Kirkland, WA 98033 P (425) 827 7701 F (425) 827 5424 Mineral Resource Lands of Long-Term Commercial Significance Inventory Study Thurston County Mineral Lands Project Thurston County, Washington Geologic Inventory and Classification Study TABLE OF CONTENTS Page 1.0 INTRODUCTION ....................................................................................................................................... 1 2.0 METHODOLOGY....................................................................................................................................... 1 2.1 Introduction .................................................................................................................................... 1 2.2 Description of the Resource Identification Process ........................................................................ 2 2.2.1 Geologic Information and the Identification Process ......................................................... 2 2.2.2 Other Pertinent Geologic Information ................................................................................ 4 2.2.3 LiDAR Information and the Identification Process .............................................................. 4 2.3 Description of the Resource Classification Factors ......................................................................... 5 2.3.1 Sources of Resource Quantity/Quality Information ............................................................ 5 2.3.2 Quality Classification and Quantity Criteria for Aggregate ................................................. 6 2.3.3 Bedrock Quality Criteria ...................................................................................................... 7 2.4 Economic Considerations in Classification ..................................................................................... 8 2.4.1 Market Value....................................................................................................................... 8 2.4.2 Market Demand .................................................................................................................. 9 3.0 PROSPECT CONSIDERATIONS ................................................................................................................ 11 3.1 Sand and Gravel Considerations ................................................................................................... 11 3.2 Quarry Rock Considerations ......................................................................................................... 12 3.3 Coal and Metal Resource Considerations ..................................................................................... 13 3.3.1 Coal ................................................................................................................................... 13 3.3.2 Iron Ore ............................................................................................................................. 14 3.3.3 Copper Ore ........................................................................................................................ 15 4.0 GEOLOGY ............................................................................................................................................... 15 4.1 Bedrock ......................................................................................................................................... 15 4.2 Sand and Gravel ............................................................................................................................ 16 4.2.1 Vashon Recessional Outwash ........................................................................................... 17 4.2.2 Vashon Advance Outwash ................................................................................................ 17 4.2.3 Pre-Vashon Outwash ........................................................................................................ 18 5.0 LIMITATIONS OF THE ANALYSIS ............................................................................................................ 18 6.0 REFERENCES .......................................................................................................................................... 20 7.0 GLOSSARY OF GEOLOGIC TERMS ........................................................................................................... 23 LIST OF TABLES Table 1. Major Sources of Information for the Thurston County Mineral Resource Lands Project .................................................................................... Attached Table 2. Thurston County Mineral Resource Lands Aggregate Quarry Rock Classification System ................................................................................. Attached Table 3. Common WSDOT Aggregate Quality Tests .................................................................... Attached Table 4. Thurston County Mineral Resource Lands Aggregate Volume Estimates......................................................................................... Attached Table 5. Thurston County Mineral Resource Lands Aggregate Volume Estimates by Quantity Type ............................................................ Attached August 30, 2017 ASSOCIATED EARTH SCIENCES, INC. JDD/ld - 160529H002-10 - Projects\20160529\TH\WP Page i Mineral Resource Lands of Long-Term Commercial Significance Inventory Study Thurston County Mineral Lands Project Thurston County, Washington Geologic Inventory and Classification Study 1.0 INTRODUCTION The Washington Growth Management Act (GMA) requires Thurston County to identify, classify, designate, and conserve mineral resource lands that have long-term commercial significance for the extraction of minerals. The Thurston County Mineral Lands project (TCML project) is designed to determine potential locations of these lands in unincorporated Thurston County, excluding areas not under the County's jurisdiction. Thurston County is reviewing its currently adopted Comprehensive Plan policies, procedures, and development regulations relating to mineral resource lands. The purpose of the TCML project, which is occurring as part of an update to the Comprehensive Plan, is to ensure that the County’s mineral resource lands program is comprehensive, effective, and consistent with the requirements of the GMA statute and rules (Revised Code of Washington [RCW] 36.70A.060, 36.70A.170, and Washington Administrative Code [WAC] 365-190-070). This “Thurston County Mineral Lands Project - Geologic Inventory and Classification Study” identifies the general geologic setting of Thurston County mineral resources and describes a comprehensive method of identifying and classifying prospects containing commercially significant mineral resources. Mineral resource lands contain deposits consisting of sand and gravel, sandstone, basalt, or other igneous rock—although the two dominant resources in the County are sand and gravel (aggregate) and igneous quarry rock. Additional information on site-specific geology can be obtained through the references presented in this report. Definitions of italicized geologic terms are included under the “Glossary” section of this report. The resource classifications identified in this report are considered preliminary and are subject to public review and discussion. Future steps in the project will consider potential environmental and land use constraints that should be considered before identified mineral resources are designated in the Comprehensive Plan. Classification categories will be reviewed and finalized as part of this process. 2.0 METHODOLOGY 2.1 Introduction The purpose of this TCML project is to identify and classify the mineral resources within Thurston County. Resource identification and classification are two distinct but related activities associated with GMA planning for mineral lands. The mineral lands inventory identifies all lands with mineral resources, and classification applies criteria relating to quality, quantity, and economic significance to categorize those resources for subsequent planning. August 30, 2017 ASSOCIATED EARTH SCIENCES, INC. JDD/ld - 160529H002-10 - Projects\20160529\TH\WP Page 1 Mineral Resource Lands of Long-Term Commercial Significance Inventory Study Thurston County Mineral Lands Project Thurston County, Washington Geologic Inventory and Classification Study The steps in the methodology are described in the following sections. The study initially determined the types of data needed to identify the location of mineral resources at the County- wide level. Associated Earth Sciences, Inc. (AESI), the County’s geology consultant (the consultant) then obtained those data from various sources and used them to create a base inventory map showing the location of mineral resources. Those mineral resources were then classified using quantity and quality information. The methodology used to identify and classify the mineral resources within Thurston County for the TCML project relies on existing public information sources. The data sources are described in Table 1 with links to most of the data sources provided in the references. The information can be independently
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