Baykeeper sues to limit alleged mining threat to San Francisco Bay’s sandy floor

Environmental advocates say the San Francisco Bay’s sandy floor, the habitat for fish and wildlife, is under threat from mining leases based on flawed data.

San Francisco Baykeeper filed a lawsuit Thursday against the California State Lands Commission for authorizing 10-year leases that allow Martin Marietta Marine Operations LLC and Lind Marine LLC to harvest the Bay’s sand for concrete and asphalt.