WhiteHawk Energy LLC has entered a deal to acquire a package of Haynesville Shale mineral and royalty assets for up to $105 million, management said Tuesday.

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The assets cover about 375,000 gross unit acres in northwestern Louisiana, and are operated by exploration and production firms including Southwestern Energy Co., Chesapeake Energy Corp., Aethon Energy Management LLC and Comstock Resources Inc., according to Philadelphia-based WhiteHawk.

The assets to be acquired include more than 1,230 horizontal wells, 157 line of sight wells and 44 permitted wells, all in the core of the dry gas-rich Haynesville.

Following the acquisition, which has an initial effective date of Feb. 1, WhiteHawk would own minerals and royalties in the core of the Haynesville and Marcellus shales...