What changed in this filing

/stocks — the workspaceLOADING

Item 2. Properties

2025-02-14 compared with 2024-02-23 · 16 added, 15 removed, 105 unchanged (23% of the section changed)

29 unchanged sentences

The life cycle of mining sand, gravel and hard rock begins with exploration and continues through development and production.

After a sand, gravel and hard rock deposit has been identified through exploration, the mine is developed before production begins.

After a sand, gravel and hard rock deposit has been identified through exploration, the mine is developed

before production begins.

The following table presents the number of properties in each respective stage as of December 31, 2024 for all mining properties:

11 unchanged sentences

As of December 31, 2024, California and Utah were the only individual states/provinces that comprised more than 10% of our total mining operations.

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 Wine Group, Aerojet North White Rock and Coalinga Section 30 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 and Bamberton Quarry were the only mines 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, 2024 (tons in millions):

4 unchanged sentences

Aerojet North White Rock 32.0 Sand and Gravel — — 32.0 Sand and Gravel — —

Coalinga Section 30 — — 18.0 Sand and Gravel 18.0 Sand and Gravel — —

All other California 15.4 Sand and Gravel 1.6 Sand and Gravel 17.0 Sand and Gravel — —

Total California 47.4 — 71.0 — 118.4 — — —

Utah 3.9 Sand and Gravel — — 3.9 Sand and Gravel — —

All other states/provinces 12.6 Sand and Gravel 8.6 Sand and Gravel 21.2 Sand and Gravel 0.7 Sand and Gravel

4 unchanged sentences

Utah 9.6 Hard Rock — — 9.6 Hard Rock — —

All other states/provinces 10.2 Hard Rock — — 10.2 Hard Rock 33.0 Hard Rock

Bamberton Quarry (Canada) 42.4 Hard Rock 2.3 Hard Rock 44.7 Hard Rock 39.3 Hard Rock

All other states/provinces — — — — — — 33.0 Hard Rock

Total 280.0 — 2.3 — 282.3 — 72.3 —

13 unchanged sentences

Waste factors for proven and probable reserves range up to 44% depending on the deposit type, market characteristics and extraction feasibility.

As of December 31, 2023, California and Utah were the only individual states/provinces 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.

As of December 31, 2024, California and Utah were the only individual states/provinces that comprised more than 10% of our total mining operations, Coalinga, Solari and Grantsville were the only mines that comprised 10% or more of our mineral reserves for sand and gravel and Handley Quarry, Lockwood Mustang and Bamberton Quarry were the only mines that comprised 10% or more of our mineral reserves for hard rock.

The following table presents information about mineral reserves at December 31, 2024 (tons in millions):

3 unchanged sentences

Coalinga 115.5 Sand and Gravel — — 115.5 Sand and Gravel

Solari 106.4 Sand and Gravel 8.2 Sand and Gravel 114.6 Sand and Gravel

All other California 148.1 Sand and Gravel 8.8 Sand and Gravel 156.9 Sand and Gravel

Total California 370.0 — 17.0 — 387.0 —

Utah 113.3 Sand and Gravel 0.1 Sand and Gravel 113.4 Sand and Gravel

Grantsville 99.0 Sand and Gravel — — 99.0 Sand and Gravel

All other Utah 12.8 Sand and Gravel 0.1 Sand and Gravel 12.9 Sand and Gravel

Total Utah 111.8 — 0.1 — 111.9 —

All other states/provinces 130.6 Sand and Gravel 56.1 Sand and Gravel 186.7 Sand and Gravel

4 unchanged sentences

Utah 27.1 Hard Rock — — 27.1 Hard Rock

Lockwood Mustang (Nevada) 17.7 Hard Rock 32.0 Hard Rock 49.7 Hard Rock

Bamberton Quarry (Canada) 39.8 Hard Rock — — 39.8 Hard Rock

All other states/provinces 20.6 Hard Rock 32.4 Hard Rock 53.0 Hard Rock

7 unchanged sentences

• quality control and quality assurance programs including management identifying the qualified person(s) with the appropriate background and qualifications to prepare the information used for disclosure purposes;

• verification of analytical procedures including management reviewing the mineral resource and reserve report information for completeness, accuracy and appropriateness, such as categorization, inclusion of technical, economic and operational factors, discounted cash flow analysis inputs, assumptions and calculations, and mining, metallurgical, legal, environmental, social and governmental modifying factors as well as comparison of estimates to historic production and prior period estimates;

• verification of analytical procedures including management reviewing the mineral resource and reserve report information for completeness, accuracy and appropriateness, such as categorization, inclusion of technical, economic and operational factors, discounted cash flow analysis inputs, assumptions and calculations, and mining, metallurgical, legal, environmental compliance and governmental modifying factors as well as comparison of estimates to historic production and prior period estimates;

• review of disclosures to ensure compliance with requirements.

2 unchanged sentences

Some of our sites may have more than one crushing, concrete or asphalt processing plant.

The following table presents the number of plants we owned as of the respective dates:

The following table presents the number of plants we owned and leased as of the respective dates:

December 31, 2024 2023

4 unchanged sentences

Lime slurry plants 6 6

(1) Three of our asphalt concrete plants were operated under lease agreements for the years ended December 31, 2024 and 2023.

These plants are used by both of our reportable segments.

Other Properties

The following table provides our estimate of certain information about other properties as of December 31, 2023:

Land Area (acres) Buildings (square feet)

Office and shop space (owned and leased) 1,217 1,617,556

The office and shop space is used by both of our reportable segments.

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.

What changed 10-K

Item 2. Properties