I live in Mecosta County and can go to the county clerk's office to search vital records for him during that time period, as well as his sister and mother if you need them. Just give me the names. Ishpeming (m, not nn) is in Marquette County in the upper peninsula of Michigan. It is copper mining country for sure! You have probably tried the 1900 censuses for both areas already. But there may be some vital records in one place or the other. Try asking for help in Marquette Co., if you haven't already. I am in Denver right now but can search when I get back after the 30th.