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Property, Plant and Mine Development, net
9 Months Ended
Sep. 30, 2021
Property, Plant and Mine Development, net  
Property, Plant and Mine Development, net

9. Property, Plant and Mine Development, net

At September 30, 2021 and December 31, 2020, property, plant and mine development, net consisted of the following:

As of

As of

September 30, 

December 31, 

2021

2020

(Unaudited)

(in thousands)

Asset retirement costs

$

1,071

$

1,064

Construction-in-progress(1)

13,265

7,158

Furniture and office equipment

1,896

1,839

Land

230

230

Light vehicles and other mobile equipment

2,236

2,192

Machinery and equipment

33,083

31,227

Mill facilities and infrastructure

24,455

24,407

Mine Development

89,760

83,859

Software and licenses

1,636

1,619

Subtotal

167,632

153,595

Accumulated depreciation and amortization

(101,315)

(91,084)

Total

$

66,317

$

62,511

(1)Includes accrued capital expenditures of $1.0 million both at September 30, 2021 and December 31, 2020.

The Company recorded depreciation and amortization expense of $3.5 million and $11.3 million for the three and nine months ended September 30, 2021, as compared with $4.3 million and $13.5 million for the same periods ended September 30, 2020.