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3/25/22, 9:42 AM road -20210930 <br />Table of Contents <br />Note 7 - Other Assets <br />Prepaid Expenses and Other Current Assets <br />Prepaid expenses and other current assets consisted of the following at September 30, 2021 and 2020 (in thousands): <br />Prepaid expenses <br />Other current assets <br />Total prepaid expenses and other current assets <br />Other Assets <br />September 30, <br />2021 2020 <br />$ 5,438 $ 3,612 <br />2,352 1,429 <br />$ 7,790 $ 5,041 <br />Other assets consisted of the following at September 30, 2021 and 2020 (in thousands): <br />Notes receivable <br />Other assets <br />Total other assets <br />Note 8 - Property, Plant and Equipment <br />September 30, <br />2021 2020 <br />$ 1,367 $ 1,622 <br />4,167 162 <br />$ 5,534 $ 1,784 <br />Property, plant and equipment at September 30, 2021 and 2020 consisted of the following (in thousands): <br />Construction equipment <br />Plants <br />Land and improvements <br />Mineral reserves <br />Buildings <br />Furniture and fixtures <br />Leasehold improvements <br />Total property, plant and equipment, gross <br />Accumulated depreciation, depletion and amortization <br />Construction in progress <br />Total property, plant and equipment, net <br />September 30, <br />2021 2020 <br />$ 333,966 $ <br />253,157 <br />143,172 <br />102,392 <br />53,415 <br />38,647 <br />86,556 <br />22,205 <br />27,163 <br />18,307 <br />6,426 <br />5,648 <br />1,230 <br />1,135 <br />651,928 <br />441,491 <br />(250,803) <br />(209,532) <br />3,707 <br />5,271 <br />$ 404,832 $ <br />237,230 <br />Depreciation, depletion and amortization expense related to property, plant and equipment for the fiscal years ended September 30, <br />2021, 2020 and 2019 was $49.5 million, $39.1 million and $30.1 million, respectively. <br />Mineral reserves, net of accumulated depletion, for the years ended September 30, 2021 and 2020 were $84.1 million and <br />$20.3 million, respectively. These amounts include $2.1 million and $0.0 million of asset retirement obligation assets, net of <br />accumulated depletion associated with active mining operations for the years ended September 30, 2021 and 2020, respectively and <br />$2.7 million and $0.0 million of capitalized stripping costs, net of accumulated depletion associated with development stage mining <br />operations for the fiscal years ended September 30, 2021 and 2020, respectively. <br />60 <br />https://www.sec.gov/Archivestedgar/data/0001718227/000171822721000107/road-20210930.htm 105/144 <br />