Property, plant and equipment and mining properties, net consist of the following:
In thousandsDecember 31, 2025December 31, 2024
Mine development$1,657,873 $1,502,457 
Mineral interests1,683,564 833,564 
Land9,961 9,000 
Facilities and equipment(1)
1,741,055 1,517,170 
Construction in progress129,662 145,732 
Total$5,222,115 $4,007,923 
Accumulated depreciation, depletion and amortization(2)
(2,477,231)(2,190,307)
Property, plant and equipment and mining properties, net$2,744,884 $1,817,616 
(1) Includes $123.8 million and $170.1 million associated with facilities and equipment assets under finance leases at December 31, 2025 and December 31, 2024, respectively.
(2) Includes $75.1 million and $63.3 million of accumulated amortization related to assets under finance leases at December 31, 2025 and December 31, 2024, respectively.

About PP&E Disclosures

The PP&E disclosure details a company's physical asset base — land, buildings, machinery, and equipment — along with the depreciation methods and useful life assumptions that determine how these costs flow through the income statement. Capitalization policy thresholds reveal management's judgment on the boundary between expense and asset, directly affecting both reported earnings and asset values.

Key signals: changes in estimated useful lives or depreciation methods can materially shift reported earnings without any operational change. Compare capital expenditures against depreciation expense — when capex consistently trails depreciation, the asset base may be aging and underinvested. Watch for large asset impairments or write-downs that signal overvalued carrying amounts. Asset retirement obligations reveal future environmental or decommissioning costs that are often underappreciated. Compare PP&E intensity (PP&E-to-revenue) against industry peers to assess capital efficiency and competitive positioning.