December 31,

2024

2023

Mining properties, including asset retirement obligations

$

958,858

$

911,018

Development costs

671,741

630,391

Plants and equipment

1,805,236

1,666,577

Land

35,680

35,112

Mineral interests

1,166,045

1,164,390

Construction in progress

66,566

121,022

4,704,126

4,528,510

Less accumulated depreciation, depletion and amortization

2,010,007

1,862,260

Net carrying value

$

2,694,119

$

2,666,250