HARLAN, Ky.--The Black Mountain Corporation, operating two soft coal mines at Kenvir, Ky., today signed a union shop contract involving 1,150 men with the United Mine Workers of America.

The miners are to return to work tomorrow morning.

Signing of the contract brings to 6,000 the number of Harlau Country miners now working or ready to work under union shop agreements, and was believed to foreshadow an early end to the contract deadlock which has closed half of the mines in this area.