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i~ SAFETY PRECAUTIOWS FOR FULL BOLTING AND COMBINAT]ON PLANS 1. This is the minimum roof control plan and was formulated for normal roof conditions v,hile using the mining system(s) described. In areas where subnormal roof conditions are encountered, indicated, or anticipated, the operator shall provide additional support where necessary. If changes are to be made in the mining system that necessitates any change in the roof control plan, the plan shall be revised and approved prior to implementing the new mining system. 2. A17 personnel required to install roof supports shall be trained by a qualified supervisor designated by mine management before being assigned to perform such v,ork. This training shall insure that such persons are familiar with the functions of the support being used, proper installation procedures, and the approved roof control plan. Supervisors in charge and miners who install supports shall be informed of an approved roof control plan and any changes in a previously approved roof control plan not later than their first working shift following receipt of the approved plan. As soon as possible but no later than three +veeks after receipt of this approved plan, all provisions contained herein shall be fully explained to all miners whose duties require them to be on a "~rork- j ing section." All new miners shall have the hazards of mine roof and ribs • and the content of this plan explained to them before they start to work. 3. (a) Upon completion of the loading cycle, a reflectorized warning device, such as a "stop" sign, shall be conspicuously placed to warn persons app- roaching any area that is not permanently supported. It is to be empha- sized that the warning device has been placed to cause the person to stop, examine, aid evaluate the roof and rib conditions prior to entering the area--even after temporary supports have been installed. (b) Where required, temporary supports shall be installed immediately after the loading cycle is completed unless roof bolting machines are equipped with acceptable automated temporary supports. (i) Except when the District Manager has determined that more than 5 minutes are needed, "immediately" is inerpreted to mean that the installation of such temporary supports shall be started no later than 5 minutes after mining of the cut is completed and, afiter the installation of such supports is started, the installation of supports shall be continued until at least the minimum number are installed as required in the approved plan. If the installation of permanent supports is not started within 30 minutes after the loading cycle is completed, temporary supports . shall be installed in the entire cut on 5 foot centers. 6