The fifth season debut of Discovery Channel’s Gold Rush was Friday night’s most watched cable program, clocking nearly 3.6 million viewers — a nice jump compared to last season’s opening 2.9 million. Fueling the ratings spike for the two-hour kickoff: guys. The Gold Rush kickoff was the night’s second highest rated program on all of TV Friday night — getting edged out only by ABC’s Shark Tank. Shark Tank, for instance, logged 1.27 million guys 25-54, to Gold Rush’s 1.20…
