Quarry Properties
−Removed: In October 2018, the Securities and Exchange Commission (“SEC”) adopted amendments to modernize the property disclosure requirements for mining registrants.
−Removed: We are subject to the new rules beginning with our year ended December 31, 2021.
We own or lease quarry properties that contain mineral resources that we extract and process into construction materials.
9 unchanged sentences
Changes to the estimates and assumptions from those currently anticipated could have a material impact on the mineral resource and mineral reserve estimates.
−Removed: As of December 31, 2021, we had open pit quarry properties available for the extraction of sand, gravel and hard rock.
+Added: As of December 31, 2022, we had open pit quarry properties available for the extraction of sand, gravel and hard rock.
Both of our reportable segments use these quarry properties to extract and process sand, gravel and hard rock into construction material for internal use and for sale to third parties.
1 unchanged sentence
As of December 31, 2022, no individual mining operation was considered material to our business or financial condition. Aggregate annual production for all mining properties was 16.3 million tons, 16 million tons, and 14.3 million tons during the years ended December 31, 2022, 2021 and 2020, respectively.
−Removed: The following map shows the approximate locations of our permitted quarry properties as of December 31, 2021:
−Removed: California is the only state that comprises more than 10% of our total mining operations.
−Removed: The following tables present information about our quarry properties as of December 31, 2021, separated between California and non-California properties (tons in millions):
+Added: The following map shows the approximate locations of our permitted quarry properties as of December 31, 2022:
+Added: California, Utah and Washington are the states that individually comprise more than 10% of our total mining operations.
+Added: The following tables present information about our quarry properties as of December 31, 2022 (tons in millions):
Resources and Reserves for Each Product Type (tons)
2 unchanged sentences
Sand & Gravel
−Removed: Non-California
+Added: All Other States
(1) Owned properties are properties we own or in which we have, or it is probable that we will have, a direct or indirect economic interest.
4 unchanged sentences
The following table presents the number of properties in each respective stage as of December 31, 2022 for all mining properties:
−Removed: Non-California
+Added: All Other States
Mineral Resources
1 unchanged sentence
Estimates of measured mineral resources are based on conclusive geological evidence, sampling and testing and may be converted to a proven mineral reserve or to a probable mineral reserve. Estimates of indicated mineral resources are based on adequate geological evidence, sampling and testing and may only be converted to a probable mineral reserve when sufficient evidence is identified including consideration of modifying factors such as mining, processing, economic and environmental factors.
+Added: Modifying factors are the factors that a qualified person must apply to indicated and measured mineral resources and then evaluate to establish the economic viability of mineral reserves.
Estimates of inferred mineral resources have significant geological uncertainty based on limited geological evidence, sampling and testing and therefore may not be converted to a mineral reserve.
−Removed: As of December 31, 2021, our qualified persons estimated our measured, indicated and inferred resources to be approximately 230.7 million tons with an average permitted life of approximately 16 years at present operating levels.
−Removed: As of December 31, 2021, California was the only individual state that comprised more than 10% of our total mining operations.
−Removed: The Wine Group and Aerojet North White Rock were the only mines that comprised 10% or more of our combined measured and indicated mineral resources for sand and gravel and the Euer Ranch was the only mine that comprised 10% or more of our combined measured and indicated mineral resources for hard rock. The following table presents information about our mineral resources at December 31, 2021 (tons in millions):
+Added: As of December 31, 2022 , our qualified persons estimated our measured, indicated and inferred resources to be approximately 
+Added: 246.3  million tons with an average permitted life of approximately 
+Added: 16  years at present operating levels.
+Added: As of December 31, 2022 , California, Utah and Washington were the only individual states that comprised more than 10% of our total mining operations.
+Added: The Wine Group and Aerojet North White Rock were the only mines that comprised 10% or more of our combined measured and indicated mineral resources for sand and gravel and the Euer Ranch was the only mine that comprised 10% or more of our combined measured and indicated mineral resources for hard rock. The following table presents information about our mineral resources at December 31, 2022 (tons in millions):
Measured Mineral Resources
21 unchanged sentences
Total California
−Removed: Non-California
Sand and Gravel
Sand and Gravel
+Added: All other states
Sand and Gravel
+Added: Sand and Gravel
All other California
Total California
−Removed: Non-California
(1) The grade of product produced is contingent on market needs.
7 unchanged sentences
Additional subsurface work may be needed prior to mining the reserve.
−Removed: Modifying factors are the factors that a qualified person must apply to indicated and measured mineral resources and then evaluate in order to establish the economic viability of mineral reserves.
The modifying factors applied in the conversion of measured and indicated mineral resources to proven and probable mineral reserves during the year ended December 31, 2022 included various relevant technical and economic factors, including site infrastructure, mine design and planning, processing plant and environmental compliance and permitting.
The basis of determining the modifying factors was a combination of historical experience mining aggregates and observation.
−Removed: As of December 31, 2021, our qualified persons estimated our proven and probable reserves to be approximately 765.1 million tons with an average permitted life of approximately 19 years at present operating levels.
+Added: As of December 31, 2022, our qualified persons estimated our proven and probable reserves to be approximately 879.3 million tons with an average permitted life of approximately 28 years at present operating levels.
Waste factors for proven and probable reserves range up to 45% depending on the deposit type, market characteristics and extraction feasibility.
−Removed: As of December 31, 2021, California was the only individual state that comprised more than 10% of our total mining operations, Coalinga was the only mine that comprised 10% or more of our mineral reserves for sand and gravel and Handley Quarry was the only mine that comprised 10% or more of our mineral reserves for hard rock. The following table presents information about mineral reserves at December 31, 2021 (tons in millions):
+Added: As of December 31, 2022, California, Utah and Washington were the only individual states that comprised more than 10% of our total mining operations, Coalinga and Grantsville were the only mines that comprised 10% or more of our mineral reserves for sand and gravel and Handley Quarry was the only mine that comprised 10% or more of our mineral reserves for hard rock. The following table presents information about mineral reserves at December 31, 2022 (tons in millions):
Proven Mineral Reserves
15 unchanged sentences
Total California
−Removed: Non-California
Sand and Gravel
Sand and Gravel
+Added: All other Utah
Sand and Gravel
+Added: Sand and Gravel
+Added: Sand and Gravel
+Added: Sand and Gravel
+Added: Sand and Gravel
+Added: All other states
+Added: Sand and Gravel
+Added: Sand and Gravel
+Added: Sand and Gravel
Handley Quarry
1 unchanged sentence
Total California
−Removed: Non-California
+Added: All other states
(1) The grade of product produced is contingent on market needs.
9 unchanged sentences
Some of our sites may have more than one crushing, concrete or asphalt processing plant.
−Removed: The following table presents the number of plants we owned as of the respective dates for continuing operations:
+Added: The following table presents the number of plants we owned as of the respective dates:
Aggregate crushing plants
5 unchanged sentences
Other Properties
−Removed: The following table provides our estimate of certain information about other properties for continuing operations as of December 31, 2021:
+Added: The following table provides our estimate of certain information about other properties as of December 31, 2022:
Land Area (acres)
3 unchanged sentences
Compared sentence by sentence after normalising whitespace, quotation marks, case and digits, so re-formatting and restated figures do not read as changed language. Wording changes appear as one removal and one addition. The current filing and the prior one are authoritative.