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Property, Plant and Mine Development, net
9 Months Ended
Sep. 30, 2022
Property, Plant and Mine Development, net  
Property, Plant and Mine Development, net

8. Property, Plant and Mine Development, net

At September 30, 2022 and December 31, 2021, property, plant and mine development, net consisted of the following:

As of

As of

September 30, 

December 31, 

2022

2021

(in thousands)

Asset retirement costs

$

1,065

$

1,065

Construction-in-progress (1)

300

15,854

Furniture and office equipment

1,719

1,685

Land

9,033

9,230

Mineral interest

79,543

79,964

Light vehicles and other mobile equipment

2,328

2,224

Machinery and equipment

40,119

33,213

Mill facilities and infrastructure

35,917

24,973

Mine Development

102,457

92,138

Software and licenses

1,552

1,592

Subtotal

274,033

261,938

Accumulated depreciation and amortization

(124,801)

(105,167)

Total

$

149,232

$

156,771

(1)Includes accrued capital expenditures of $0.2 million and $1.7 million at September 30, 2022 and December 31, 2021, respectively.

The Company recorded depreciation and amortization expense of $6.6 million and $19.8 million, respectively, for the three and nine months ended September 30, 2022 as compared to $3.5 million and $11.3 million, respectively, for the same periods ended September 30, 2021.