Company: ACA
Filing Date: 2025-02-28
Form Type: 10-K
Source: 0001739445-25-000026
Chunk: 76

Company: Arcosa, Inc.
Filing Date: 2025-02-28
Form: 10-K
Item: Item 2
Chunk 76
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clamation and restoration of mining properties after mining has been completed, the discharge of materials into the environment, surface subsidence from underground mining, and the effects of mining on groundwater quality and availability. We have obtained all material permits currently required to conduct our present mining operations.

Mineral Reserves

We controlled an estimated 1.4 billion tons of mineral reserves as of December 31, 2024. Reported mineral reserves include only quantities that are owned in fee or under lease – approximately 765 million tons or 55% are located on owned land and approximately 625 million tons or 45% are located on leased land. The economic viability of our reserves was determined using average selling prices ranging from $8.07 to $106.18 per ton, depending on the location and market.

Our mineral reserves, on average, represent approximately 40 years at current production levels within the natural aggregates business and approximately 110 years at current production levels within the specialty materials business. However, certain operations may have more limited reserves and may not be able to expand. Approximately 1.1 billion tons or 83% of the reported mineral reserves are attributable to active mining operations.

As of December 31, 2024, the Company’s estimated mineral reserves by major commodity group and geographic region are as follows:

Estimated Mineral Reserves (million tons)ProvenProbableTotalOwnedLeasedNatural aggregates:Texas168.0 28.4 196.4 67 %33 %All other343.0 435.6 778.6 43 %57 %511.0 464.0 975.0 48 %52 %Specialty materials331.0 84.3 415.3 72 %28 %842.0 548.3 1,390.3 55 %45 %

Quantities of mineral reserves were estimated from geologic analysis of exploration results and the application of economic and mining parameters appropriate to the individual deposits. Estimated mineral reserves have been adjusted to account for anticipated process dilutions and losses during mining and processing involved in producing saleable products. Economic viability of the reported mineral reserves has been demonstrated using three-year trailing average product prices on a per-property basis.

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Mineral Resources

We controlled an estimated 333 million tons of mineral resources as of December 31, 2024, exclusive of our reported mineral reserves. Our mineral resource estimates are based on an initial assessment using average selling price assumptions ranging from $7.96 to