UNC Resources, following a radical restructuring of its operations, reported profits of $3.7 million for the quarter ended June 30 (16 cents a share), down from $18.1 million ($1.20) for the comparable period a year ago.

However, last year's figure included $19 million of earnings from discontinued operations. The company recently shed its uranium-mining interests to concentrate on services, manufacturing and new technologies.

Earnings from continuing operations were $2 million (9 cents) for the second quarter, compared with a loss of $800,000 (3 cents) for the comparable period in 1984, the company said. A tax-loss carryforward provided the rest of the company's earnings in its most recent quarter.

* McLean-based Primark Corp. reported slightly higher profits for the second quarter, although net income was still down for the first half of the year. Net income for the second quarter was $8.5 million (88 cents per share), compared with $7.8 million (83 cents) for the same period a year ago. For the year to June 30, though, net income dropped from $44.9 million ($4.80) to $42.7 million ($4.45).

Primark is the holding company for Michigan Consolidated Gas Co.; Primark Leasing Corp.; Primark Financial Services Inc., and Hospital Satellite Network Corp., a telecommunications service of the health-care industry.