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I do not want to cast aspersions on anyone, but Steven might have been lucky during his mountain flying. I have flown over the Cascade mountains, the Rocky Mountains, and such many times. The fellow in the Cub was also lucky. Here are some tips offered "free of charge".
Before flying in the mountains, get some introduction from an expert. Mine was my dad, who among other things, flew the Hump in WW II, accumulated more than 40,000 hours as a military pilot, spray pilot, instructor, and so on. Besides normal instruction, he made me fly with instruments tapped over (except oil and temp guages), land in fields, learn arerobatics, and on and on and on.
Get a detailed weather report, and, while flying up canyons. As for ridges, always fly on the downwind side when the wind is parallel to the ridge (get the updraft, not the downdraft. Give a pass plenty of altitude when the wind is perpendicular to the ridge (my minimum is 2,000 feet. NEVER fly up the middle of a canyon.
Do not fly in the mountains when the wind exceeds half the stall performance of your airplane.
Do fly in the mornings, best when the wind is calm.
Study evey detail of approaching and landing on a mountain strip BEFORE trying to do so. For example, years ago, the Minam River in Oregon has a strip that required flying into the canyon, flying low about a half-file mile up the river, noting a rock marked with an X, and landing immediately after flying around the bend in the river that came a few yards after rounding the rock.
Hope this helps, along with anything else you can learn from pilots who have flown done mountain flying.