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Are you only development jumbo drifts ?
Or do you have wide enough veins for Jumbo ? Good if so. Otherwise jackleg for minimum dilution.
I miss it. The race to the face. Day goes by fast on contract getting a cycle and all else you can get done.
Your not peewee by chance.
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Our development is generally no larger than 10'x10'. The veins tend to swell out with depth, but the ore zone is typically 4-8' wide.
Jumbos haven't done well in this district, particularly electric/hydraulic machines. They're too expensive and technically intensive for a small operation to keep running. We do have a Gardner Denver Universal Jumbo module bolted to a Young Buggy frame, but it blew up its air motor and hydraulic pump after losing a hammer and has been parked awaiting repairs for a year.
A modified air track (GD 3100A) has been the only larger drill to survive mining down here for long. The guys swear by 83s.