Note 8. Property and Equipment 

Property and equipment: 

Property and equipment consisted of the following as of March 31, 2022 and December 31, 2021:

During the three months ended March 31, 2022, the Company received 6,894 miners related to its current purchase contracts with Bitmain and, as of March 31, 2022, had deployed a total of 42,919 miners in its mining operation.

During the three months ended March 31, 2022, the Company paid approximately $103.2 million as deposits, primarily for miners, which are scheduled to be delivered on a monthly basis through December 2022. As of March 31, 2022, the Company reclassified $39.0 million to property and equipment in connection with the deployment of miners at the Whinstone Facility. During the three months ended March 31, 2022, the Company received 6,894 miners at the Whinstone Facility.

During the year ended December 31, 2021, we entered into six additional purchase agreements with Bitmain to acquire 52,500 Antminer model S19j (90 Terahash per second) (“TH/s”) miners and 30,000 of their latest Antminer model S19XP (140 TH/s) miners for a combined total purchase price of approximately $535.0 million. Pursuant to these agreements, approximately $214.4 million remains payable to Bitmain in installments in advance of shipment of the miners, which is scheduled to occur on a monthly basis through December 2022.

Depreciation and amortization expense related to property and equipment totaled approximately $13.9 million and $2.8 million, for the three months ended March 31, 2022 and 2021, respectively.

Depreciation is computed on the straight-line basis for the periods the assets are in service.

Commitment:

As of March 31, 2022, the Company had outstanding executed purchase agreements for the purchase of miners from Bitmain for a total of 41,601 new S19j-Pro model miners and 30,000 new S19XP model miners, scheduled to be delivered through December 2022, and had paid a deposit of 62% of the total purchase price. A summary of the purchase agreement commitments, deposits paid and expected delivery timing (remaining balances are payable in advance of shipping) is summarized as follows (in thousands):

* Pursuant to the Company’s agreements with Bitmain, the Company is responsible for all shipping charges incurred in connection with the delivery of the miners.