effectiveness of the tax status election and the completion of the related transactions, our minerals business continues to be conducted through the Operating Company, which is taxed as a partnership for federal and state income tax purposes. This structure is anticipated to provide significant benefits to our business, including operational effectiveness, acquisition and disposition transactional planning flexibility and income tax efficiency. We refer to the foregoing transactions, other than the Tax Election, as the Recapitalization Transaction. For additional information regarding the tax status election and the Recapitalization Transaction, please refer to our Current Report on Form8-K filed with the Securities and Exchange Commission, or the SEC, on May 15, 2018, which is incorporated in this prospectus supplement by reference.
Recent and Pending Acquisitions
During the second quarter of 2018, we acquired from unrelated third-party sellers mineral interests underlying 53,861 gross (924 net royalty) acres in the Permian Basin for an aggregate of approximately $103 million, subject to post-closing adjustments. Further, from the end of the second quarter of 2018 through July 23, 2018, we acquired from unrelated third-party sellers additional mineral interests underlying 24,405 gross (375 net royalty) acres in the Permian Basin for an aggregate of approximately $42.8 million, subject to post-closing adjustments. As a result, as of July 23, 2018, our assets included mineral interests underlying 460,776 gross (11,826 net royalty) acres primarily in the Permian Basin and the Eagle Ford Shale. These acquisitions were primarily funded with cash on hand and borrowings under our revolving credit facility. Overall, since March 31, 2018, we have closed 32 acquisitions.
Since the end of the second quarter of 2018, we have also entered into definitive agreements with unrelated third-party sellers to acquire mineral interests underlying 1,236 gross (182 net royalty) acres in the Permian Basin for an aggregate of approximately $18.1 million, subject to post-closing adjustments. In addition, on July 27, 2018, we entered into a definitive agreement with Diamondback to acquire mineral interests underlying 34,349 gross (1,696 net royalty) acres in the Permian Basin, or the Drop-down Assets, for approximately $175.0 million, subject to post-closing adjustments. We refer to these pending acquisitions collectively as the Pending Acquisitions. After giving pro forma effect to the Pending Acquisitions, as of July 23, 2018, our assets would have included mineral interests underlying 496,361 gross (13,705 net royalty) acres. Following the closing of the Pending Acquisitions, Diamondback will operate approximately 39% of our net royalty acres. We intend to fund the Pending Acquisitions with cash on hand and borrowings under our revolving credit facility. We anticipate closing the Pending Acquisitions during the third quarter of 2018. However, the Pending Acquisitions remain subject to completion of due diligence and satisfaction of other closing conditions. There can be no assurance that we will complete the Pending Acquisitions on the terms contemplated in this prospectus supplement or at all. As of July 30, 2018, there were six Pending Acquisitions remaining to be closed.
As of July 30, 2018, before giving effect to any of the Pending Acquisitions, there were approximately 2,064 existing horizontal wells and approximately 275 active horizontal well permits for locations on our mineral acreage. Additionally, operators on our properties informed us that there were 25 rigs operating on our mineral acreage as of that date. We estimate that production on the Drop-down Assets will be 960 BOE/d over the next twelve months. Achieving this production estimate will depend on numerous factors outside our control and subject to change, including the level of Diamondback’s (and our other operators’) capital spending, commodity prices, rig availability, services availability, proppant availability, takeaway capacity as well as other factors. To the extent any of these factors change adversely, this estimate may not be achieved. Actual operating results may differ materially from this estimate.
Second Quarter Cash Distribution
The board of directors of our general partner approved a cash distribution attributable to the period ended June 30, 2018 of $0.60 per common unit, payable on August 20, 2018 to common unitholders of record at the close of business on August 13, 2018.