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PROPERTY, PLANT AND MINE DEVELOPMENT
 9 Months Ended
Sep. 30, 2022
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND MINE DEVELOPMENT PROPERTY, PLANT AND MINE DEVELOPMENT
Property, plant and mine development, net, is presented in the following table:
September 30,
2022		December 31,
2021
Mining interests$54,955,840 $39,303,043 
Mine development2,461,131 — 
Land688,829 688,829 
Leasehold improvements276,421 — 
Facilities and equipment548,698 107,248 
Construction in process5,456,049 — 
Property, plant and mine development64,386,968 40,099,120 
Accumulated depreciation(44,595)(43,766)
Property, plant and mine development, net$64,342,373 $40,055,354 
Depletion of mining interests and mine development assets does not commence until the assets are placed in service. As of September 30, 2022, we have not recorded depletion expense for any of our mining interests or mine development assets.
Mining interests and mine development costs relate to our Carolina Lithium project. The vast majority of our construction in process relates to capitalized costs associated with our Tennessee Lithium and Carolina Lithium projects.
Depreciation expense is included in “General and administrative expenses” in our consolidated statements of operations. Depreciation expense was $21,267 and $3,733 for the three months ended September 30, 2022 and 2021, respectively, and $32,475 and $6,485 for the nine months ended September 30, 2022 and 2021, respectively.