SAVANNAH, Ga. — A mining company seeking to dig for minerals near the vast wildlife refuge in the Okefenokee Swamp has reworked its plan to substantially shrink the mine’s initial footprint in an environmentally sensitive area near the Georgia-Florida line.

The Army Corps of Engineers made public Friday a new permit application submitted by Twin Pine Minerals of Alabama, which withdrew its original proposal last month. The company wants to mine for titanium dioxide less than 3 miles (4.8 kilometers) from the swamp’s edge.

The swamp is home to the Okefenokee National Wildlife Refuge, the largest federally protected refuge east of the Mississippi River, covering nearly 630 square miles (1,631 sq. kilometers). Critics have warned the mining project could cause irreparable harm to the swamp’s fragile ecosystem that serves as habitat to alligators, bald eagles and other protected species.

The company’s new permit application submitted March 4 would shrink the size of the initial area to be mined to 898 acres (3.6 square kilometers), compared to a proposed 1,450 acres (5.87 square kilometers) under the original proposal….