BSN, the food and drinks conglomerate, announced that a subsidiary, Brasseries Kronenbourg, signed a deal giving Guinness Import rights to distribute Kronenbourg beer in the United States . . . Merck & Co. said the sale of its Calgon Carbon unit to a group of investors led by members of the management of Calgon has been completed. . . . Arizona Silver said it is concluding an agreement to acquire the operating rights and controlling interest in a former high-grade gold mine located in Sierra County, Calif.