NEWS RELEASE

Twin Mining’s Wholly-Owned Atlanta Gold Mine Passes a
Significant Milestone Towards Production.

Toronto, Ontario (March 3, 2005) - Twin Mining Corporation (TWG-TSX) is pleased to report that Atlanta Gold Corporation has filed a Supplement to the Plan Of Operations for the Atlanta Gold Project with the U.S. Forest Service. The Forest Service advised Atlanta Gold Corporation of America Inc. (“Atlanta Gold”) that the supplement meets the agency’s requirements for submitting a Plan of Operations, and the necessary environmental analysis can proceed.

In accordance with US Federal laws and regulations, the US Forest Service’s role is either to approve Atlanta Gold’s Plan of Operations as submitted, or to require changes to the plan prior to approval to minimize impacts to surface resources. This decision will be made following completion of the environmental analysis, to be documented in an Environmental Impact Statement (“EIS”). The Draft EIS is expected to be completed during the second half of 2005.

The project will also be evaluated concurrently under the Idaho Joint Review Process (IJRP). The IJRP is designed to coordinate state and federal agency review and permitting of proposed mining projects in Idaho.

The supplement includes detailed specifications to the plan of operations that are the results of public and agency input and improvements to the mining economics that were developed during the full feasibility study completed in November 2004. The supplement can be accessed at www.atlantagoldeis.com.

“We have made great improvements in the mining plan at Atlanta during Feasibility engineering,” said Bruce Thorndycraft, Atlanta Gold’s General Manager. “The overall foot print of the mine is more compact and we have redesigned facilities to address issues raised by earlier public and agency review of our proposal. Significant improvements to the project economics were made through detailed engineering of the Monarch and Idaho pits. The resulting plan yields 525,000 ounces of gold and 1,084,000 ounces of silver at a rate of 110,000 ounces of gold and 280,000 ounces of silver per year for the first 3 years at a cash cost of $188/oz gold. I am pleased to head this project which has all the indications of a company maker.”

Twin Mining’s assets comprise diamond properties under exploration in Canada’s eastern Arctic, the near production Atlanta Gold Mine in Idaho, U.S.A. and the Abitibi gold properties under exploration in Quebec.

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