INT'L MINERALS PROJECT TO BOOST HOG LEAN WEIGHT International Minerals and Chemical Corp said its board approved a 50 mln dlrs budget over the next several years to build production facilities for a newly developed product to be used to improve the lean weight of hogs. The new product, porcine somatotropin (PST) is described as a natural bio-synthetic protein that improves the lean weight and rate of weight gain, as well as reduces the cost of feed for market hogs, the company said. Specific details of the PST production project, including sites for proposed facilities and engineering plans, were not disclosed. International Minerals said it set a completion target for the spring of 1989, by which time necessary Food and Drug Administration approvals are expected to be obtained.