PINNACLE WEST CAPITAL <PNW> BUYS MINERAL RIGHTS Pinnacle West Capital Corp said its Malapai Resources Co units bought the mineral rights for uranium mining on about 21,000 acres in northern Wyoming from Westinghouns Electric Corp <WX>. The property is adjacent to a 34,000-acre site the company already owns. Both facilities are at expected to be in full operation in the early 1990s, with annual production of one to two mln lbs of uranium concentrates, the company said. The new site is expected to produce about 250,000 lbs of uranium in its first full year of production in 1988. The adjacent property is expected to begin in 1989.