It is possible to drill RC UG but it's rare due to the dust produced by RC drilling. Therefore all samples are drilled wet which can create issues with sampling accuracy (introduces bias with fines being washed away).
This paper covers it in detail: 'Using Reverse Circulation drilling to improve sampling in a complex underground gold operation - an innovative approach to underground grade control at The Sunrise Dam Mine, Western Australia, Clark F, Carswell JT, 9th International Mining Geologists Conference 2013'
Ann: Pepper continues to grow - 25.24m @ 16.66g/t, page-88
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