ron i saint Aves sinntie Aaa a Ish a tecoatBe e gongs"Spa G The mine operators at the Salt Lake City meeting naturally got their hackles up and ettacked very vigorously end pointed out . aYter some discussions by some mining engin- eers at the University of Uteh that these peorle odviocusly bed never been in a urene Jum mine, That thelr echenes for ventilating uranium mines were bared on standard corel mine type of excovetion with standard tunnels at Gertain intervals snd nice ratterns whereby you cen ventilate it wherens the uranium mining Anductry 4s peculfer in that the veins come and go and they follow a very tertuous course, so thet 10 is impossible to plan the mine and set up the ventiletion sccordingly. This view was challenged hovever, by Duncan Eolliday vho pointed out that ina number of ences there peorle really Just havee n't tried and it is not nearly as bad ag it looks, superficielly,excent in certain ceses vhere the ore henpens to be rich and the flow rate of radon from the core body into the cavity of the mine is co high and it's ree latively insccescible ¢& that it is very diffi-~ cult to ventilate adequctely, DR. GLASS: Vhat sort of veekly exposures do thece miners get? ZO