Property, plant, and equipment at March 31, 2026 and December 31, 2025 consisted of the following:


(in thousands)	March 31, 2026			December 31, 2025
Depreciable property, plant and equipment
Furniture and fixtures	$	240		$	240
Vehicles		886			886
Buildings		388			388
Leasehold improvements		2,076			2,076
Machinery and equipment		29,536			29,162
Pipelines and pits		3,999			3,768
Total depreciable property, plant and equipment, gross		37,125			36,520
Accumulated depreciation		(5,272	)		(4,120	)
Total depreciable property, plant and equipment, net		31,853			32,400
Non-depreciable property, plant and equipment
Land		23,151			23,154
Construction in progress		101			32
Total non-depreciable property, plant and equipment		23,252			23,186
Total property, plant and equipment, net	$	55,105		$	55,586

All property and equipment are held and used in the United States. Depreciation expense for property, plant, and equipment for the three months ended March 31, 2026 and 2025 was approximately $1.2 million and $0.3 million, respectively.