Net property, plant and equipment consists of:
 December 31,
 20252024
Machinery, equipment and tooling$48,865 $43,041 
SmartSystems32,583 32,551 
Vehicles4,261 3,961 
Furniture and fixtures1,420 1,368 
Plant and buildings223,104 218,546 
Real estate properties7,738 7,161 
Railroad and sidings36,677 35,728 
Land and land improvements40,627 40,627 
Asset retirement obligation23,454 23,283 
Mineral properties7,442 7,442 
Deferred stripping costs6,757 4,434 
Construction in progress2,541 3,216 
435,469 421,358 
Less: accumulated depreciation and depletion212,215 184,666 
Total property, plant and equipment, net$223,254 $236,692 

Historical Timeline

Fiscal YearFiled
2025Feb 26, 2026Showing above
2024Mar 4, 2025
2023Mar 11, 2024
2022Feb 28, 2023
2021Mar 8, 2022
2020Mar 3, 2021
2019Feb 26, 2020
2018Mar 14, 2019
2017Mar 15, 2018
2016Mar 16, 2017

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.