If you are, or were a movie-goer of my age, chances are you would have watched this star-studded cliffhanger of the American West style: "Maccanas Gold" of 1969. Attached below is the Mandarin-dubbed one; enjoy it if you like to watch it again in reminiscent mood.  

美国西部片(点赞加关注，每天按时更新) - 西瓜视频 (ixigua.com)