Tenneco Inc., a Houston-based company with precious metals operations in Utah, has donated more than 100,000 acres of mineral rights to the Nature Conservancy, a non-profit organization dedicated to the protection of lands and water to preserve plants and animals.

Included in the donation were 81,000 acres of mineral rights on the conservancy's Gray Ranch Preserve in southern New Mexico and 20,000 acres of mineral reserves on the Sycan Marsh in Oregon.