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Display Name:   Designated Mineral Resource Lands

Description:   Last updated on 12/24/2020 by ERP.This data shows the designated mineral resource lands in Thurston County. This dataset is based on underlying geology and other factors that may support the commercial extraction of minerals. The basis of analysis was WADNR's 24 and 100K geology data that was adjusted to Thurston County 2011 LiDAR. Thurston County contracted Associated Earth Science,Inc.(AESI) to identify and classify mineral resources in the County and create a base inventory map showing the location of mineral resources. Resource classification (for example, A1, B3, etc.) for sand and gravel (aggregate) and quarry rock was made based on quality, quantity and other information derived from Thurston County, Washington State and Federal sources.Sand and Gravel(Aggregate)Resource Stratadecreasing resource qualityNon-ResourceQuality Type AQuality Type BQuality Type CQuality Type DDecreasing resource thickness and volumeQuantity Type 1•<5 percent fines•70:30 to 30:70 sand and gravel ratio•>25 years’ life expectancy•Minimum 240,000yd3/acre•>100 feet thick•Minimum overburden•Up to 15 percent fines•70:30 to 30:70 sand and gravel ratio•>25 years’ life expectancy•Minimum 240,000 yd3/acre•>100 feet thick•Minimum overburden•Up to 25 percent fines•70:30 to 30:70 sand and gravel ratio•>25 years’ life expectancy•Minimum 240,000yd3/acre•>100 feet thick•Minimum overburden•Generally unsuitable for extraction •>25 percent fines, may have high organic content•Out of 70:30 to 30:70 sand and gravel range•No life expectancy•<15,000 yd3/acre•Limited depthQuantity Type 2•<5 percent fines•70:30 to 30:70 sand and gravel ratio•10 to 25 years’ life expectancy•Average 80,000 to 240,000 yd3/acre•50 to I00 feet thick•Overburden <15 feet thick•Up to 15 percent fines•70:30 to 30:70 sand and gravel ratio•10 to 25 years’ life expectancy•Average 80,000 to 240,000 yd3/acre•50 to 100 feet thick•Overburden <15feet thick•Up to 25 percent fines•70:30 to 30:70 sand and gravel ratio•10 to 25 years’ life expectancy•Average 80,000 to 240,000 yd3/acre•50 to 100 feet thick•Overburden <15 feet thickQuantity Type 3•<5 percent fines•70:30 to 30:70 sand and gravel ratioLife expectancy variable, generally <10 years•Average 15,000 to 80,000 yd3/acre•Thickness varies, typically <50 feet•Up to 15 percent fines•70:30 to 30:70 sand and gravel ratio•Life expectancy variable, generally <10 years•Average 15,000 to •80,000 yd3/acre•Thickness varies, typically <50feet•Up to 25 percent fines•70:30 to 30:70 sand and gravel ratio•Life expectancy variable, generally <10 years•Average 15,000 to 80,000 yd3/ acre•Thickness varies, typically<50 feetQuarry Rock (Bedrock) Quality Type AQuality Type BQuality Type CQuality Type DDecreasing interbedded resource strataType 1• Formation generally well mapped and (or) high percentage of formation contains resource strata of type AMeets or exceeds WSDOT specs for all rock products• Minimal amount of fractures•Minimal percent waste rock•20 percent or more rockery- size material produced•Formation mostly divided locally and contains a high percentage of resource strata of type B•Meets WSDOT specs for some rock products•Fractures vary from minor to very prevalent•Up to 10 percent waste rock• 20 percent or less rockery-size material produced•Formation mostly divided locally and contains a high percentage of resource strata of type C•Rock will not meet WSDOT specs•Highly fractured•10 to 30 percent waste rock•Minimal rockery-size material produced•Generally unsuitable for extraction•>30 percent waste rock•Highly to very highly fractured and (or) weathered and (or) poorly lithified•No rockery-size material producedType 2None•Formation undividedand >50% of formation contains mostly resource strata of type B as defined for Type 1 bedrock•Formation undividedand >50% of formation contains mostly resource strata of type C as defined for Type 1 bedrockType 3•Formation undividedand <50% formation contains mostly resource strata of type B as defined for Type 1•Formation undividedand <50% of formation contains mostly resource strata of type C as defined for Type 1The mineral resource inventory was adopted on November 12, 2019 with Resolution 15836 as Map N-3.The mineral resource inventory was then used as a basis to create the mineral resource lands designation. Designated mineral resource lands were determined through evaluation of the mineral resource inventory data based on location and parcel size considerations. Areas were added or removed from the inventory based on the guidance from the Thurston County Board of County Commissioners, Planning Commission, and input from the public. These included: Proximity to public preserves, parks, national wildlife refuges, state conservation areasProximity to Cities, Urban Growth Areas, and Federal or Tribal LandsLocations of transportation rights of wayLocations of Thurston County historic sitesLocations of previously designated and current permitted mining locationsParcel size threshold of a minimum of 5 acres in sizeParcel adjacency where more than 40% of the surrounding parcels are less than 5 acres in sizeInformation regarding the analysis processes is included in the Metadata Lineage and in documentation stored by the Thurston County Community Planning and Economic Development.

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