yeah smoking it or drying it by lying it in strips in the sun. if the air is dry enough it won't rot and will just turn into jerkey which lasts for ages. Many still do it to this day
I also just looked this up, but apparently mammoths were still walking the earth as early as only 3000 years ago! I thought it was way farther. The idea to bring them back to northern areas of earth doesnt sound so far fetched