{"formats":[{"name":"JSON","format":"json","url":"\/downloads\/2025\/code-json\/45.2-836.json"},{"name":"Plain Text","format":"text","url":"\/downloads\/2025\/code-text\/45.2-836.txt"},{"name":"XML","format":"xml","url":"\/downloads\/2025\/code-xml\/45.2-836.xml"},{"name":"HTML","format":"html","url":"\/downloads\/2025\/code-html\/45.2-836.html"}],"law_id":78287,"edition_id":1,"section_id":78287,"structure_id":14031,"section_number":"45.2-836","catch_line":" Quantity of air","history":"Code 1950, \u00a7\u00a7 45-4.1, 45-9, 45-12, 45-60.4, 45-74; 1954, c. 191; 1966, c. 594, \u00a7\u00a7 45.1-5, 45.1-56; 1968, c. 310; 1976, c. 598; 1978, c. 120; 1984, c. 236; 1985, c. 448; 1987, c. 470; 1990, c. 963; 1993, c. 442; 1994, c. 28, \u00a7 45.1-161.219; 1996, c. 774; 2005, c. 3; 2021, Sp. Sess. I, c. 387.","full_text":"A\n\nThe quantity of air passing through the last open crosscut shall be at least 9,000 cubic feet per minute. However, the quantity of air reaching the last open crosscut in a pillar-recovery section may be less than 9,000 cubic feet per minute if at least 9,000 cubic feet of air per minute is being delivered to the intake end of the pillar line.B\n\nThe air current at a working face shall, under all conditions, have a sufficient volume and velocity to readily dilute and carry away smoke from blasting and any flammable or harmful gases and dust.C\n\nIn a longwall or shortwall mining system:1\n\nThe quantity of air shall be at least 30,000 cubic feet per minute reaching the working face, unless otherwise approved by the Chief; and2\n\nThe velocity of air provided to control dust at designated locations on the longwall or shortwall face shall be maintained in accordance with the provisions of the mine ventilation plan approved by MSHA.D\n\nVentilation shall be maintained during the installation or removal of mechanized mining equipment.","order_by":null,"text":{"0":{"id":280640,"text":"The quantity of air passing through the last open crosscut shall be at least 9,000 cubic feet per minute. However, the quantity of air reaching the last open crosscut in a pillar-recovery section may be less than 9,000 cubic feet per minute if at least 9,000 cubic feet of air per minute is being delivered to the intake end of the pillar line.","type":"section","prefixes":["A"],"prefix":"A","entire_prefix":"A","prefix_anchor":"A","level":1,"next_prefix":"B"},"1":{"id":280641,"text":"The air current at a working face shall, under all conditions, have a sufficient volume and velocity to readily dilute and carry away smoke from blasting and any flammable or harmful gases and dust.","type":"section","prefixes":["B"],"prefix":"B","entire_prefix":"B","prefix_anchor":"B","level":1,"prior_prefix":"A","next_prefix":"C"},"2":{"id":280642,"text":"In a longwall or shortwall mining system:","type":"section","prefixes":["C"],"prefix":"C","entire_prefix":"C","prefix_anchor":"C","level":1,"prior_prefix":"B","next_prefix":"C1"},"3":{"id":280643,"text":"The quantity of air shall be at least 30,000 cubic feet per minute reaching the working face, unless otherwise approved by the Chief; and","type":"section","prefixes":["C","1"],"prefix":"1","entire_prefix":"C1","prefix_anchor":"C1","level":2,"prior_prefix":"C","next_prefix":"C2"},"4":{"id":280644,"text":"The velocity of air provided to control dust at designated locations on the longwall or shortwall face shall be maintained in accordance with the provisions of the mine ventilation plan approved by MSHA.","type":"section","prefixes":["C","2"],"prefix":"2","entire_prefix":"C2","prefix_anchor":"C2","level":2,"prior_prefix":"C1","next_prefix":"D"},"5":{"id":280645,"text":"Ventilation shall be maintained during the installation or removal of mechanized mining equipment.","type":"section","prefixes":["D"],"prefix":"D","entire_prefix":"D","prefix_anchor":"D","level":1,"prior_prefix":"C2"}},"ancestry":[{"id":14031,"edition_id":1,"name":"Ventilation, Mine Gases, and Other Hazardous Conditions","identifier":"4","label":"article","depth":5,"order_by":1,"parent_id":14030,"metadata":{},"date_created":"2026-06-26 03:46:38","date_modified":"2026-06-26 03:46:38","permalink":{"id":223537,"object_type":"structure","relational_id":14031,"identifier":"4","token":"45.2\/II\/B\/8\/4","url":"\/45.2\/II\/B\/8\/4\/","edition_id":1,"permalink":0,"preferred":1}},{"id":14030,"edition_id":1,"name":"Requirements Applicable to Underground Coal Mines; Electricity, Safety, Etc","identifier":"8","label":"chapter","depth":4,"order_by":1,"parent_id":12986,"metadata":{},"date_created":"2026-06-26 03:46:38","date_modified":"2026-06-26 03:46:38","permalink":{"id":223425,"object_type":"structure","relational_id":14030,"identifier":"8","token":"45.2\/II\/B\/8","url":"\/45.2\/II\/B\/8\/","edition_id":1,"permalink":0,"preferred":1}},{"id":12986,"edition_id":1,"name":"Underground Coal Mines","identifier":"B","label":"part","depth":3,"order_by":1,"parent_id":12985,"metadata":{},"date_created":"2026-06-26 03:44:06","date_modified":"2026-06-26 03:44:06","permalink":{"id":223095,"object_type":"structure","relational_id":12986,"identifier":"B","token":"45.2\/II\/B","url":"\/45.2\/II\/B\/","edition_id":1,"permalink":0,"preferred":1}},{"id":12985,"edition_id":1,"name":"Coal Mining","identifier":"II","label":"subtitle","depth":2,"order_by":1,"parent_id":12713,"metadata":{},"date_created":"2026-06-26 03:44:06","date_modified":"2026-06-26 03:44:06","permalink":{"id":222647,"object_type":"structure","relational_id":12985,"identifier":"II","token":"45.2\/II","url":"\/45.2\/II\/","edition_id":1,"permalink":0,"preferred":1}},{"id":12713,"edition_id":1,"name":"Mines, Minerals, and Energy","identifier":"45.2","label":"title","depth":1,"order_by":1,"parent_id":null,"metadata":{},"date_created":"2026-06-26 03:43:49","date_modified":"2026-06-26 03:43:49","permalink":{"id":222539,"object_type":"structure","relational_id":12713,"identifier":"45.2","token":"45.2","url":"\/45.2\/","edition_id":1,"permalink":0,"preferred":1}}],"structure_contents":[{"id":61647,"structure_id":14031,"section_number":"45.2-826","catch_line":" Pre-shift examinations","url":"\/45.2-826\/","token":"45.2\/II\/B\/8\/4\/45.2-826","metadata":false},{"id":75532,"structure_id":14031,"section_number":"45.2-827","catch_line":" On-shift examinations","url":"\/45.2-827\/","token":"45.2\/II\/B\/8\/4\/45.2-827","metadata":false},{"id":84889,"structure_id":14031,"section_number":"45.2-828","catch_line":" Weekly examinations","url":"\/45.2-828\/","token":"45.2\/II\/B\/8\/4\/45.2-828","metadata":false},{"id":55121,"structure_id":14031,"section_number":"45.2-829","catch_line":" Examinations of fans","url":"\/45.2-829\/","token":"45.2\/II\/B\/8\/4\/45.2-829","metadata":false},{"id":78974,"structure_id":14031,"section_number":"45.2-830","catch_line":" Record of examinations","url":"\/45.2-830\/","token":"45.2\/II\/B\/8\/4\/45.2-830","metadata":false},{"id":73101,"structure_id":14031,"section_number":"45.2-831","catch_line":" Notice of hazardous conditions","url":"\/45.2-831\/","token":"45.2\/II\/B\/8\/4\/45.2-831","metadata":false},{"id":56771,"structure_id":14031,"section_number":"45.2-832","catch_line":" Notice of monitor tampering prohibition","url":"\/45.2-832\/","token":"45.2\/II\/B\/8\/4\/45.2-832","metadata":false},{"id":84902,"structure_id":14031,"section_number":"45.2-833","catch_line":" Main fans","url":"\/45.2-833\/","token":"45.2\/II\/B\/8\/4\/45.2-833","metadata":false},{"id":64758,"structure_id":14031,"section_number":"45.2-834","catch_line":" Fan stoppage plan","url":"\/45.2-834\/","token":"45.2\/II\/B\/8\/4\/45.2-834","metadata":false},{"id":61736,"structure_id":14031,"section_number":"45.2-835","catch_line":" Auxiliary fans","url":"\/45.2-835\/","token":"45.2\/II\/B\/8\/4\/45.2-835","metadata":false},{"id":78287,"structure_id":14031,"section_number":"45.2-836","catch_line":" Quantity of air","url":"\/45.2-836\/","token":"45.2\/II\/B\/8\/4\/45.2-836","metadata":false},{"id":81164,"structure_id":14031,"section_number":"45.2-837","catch_line":" Bleeder systems","url":"\/45.2-837\/","token":"45.2\/II\/B\/8\/4\/45.2-837","metadata":false},{"id":55504,"structure_id":14031,"section_number":"45.2-838","catch_line":" Coursing of air","url":"\/45.2-838\/","token":"45.2\/II\/B\/8\/4\/45.2-838","metadata":false},{"id":75203,"structure_id":14031,"section_number":"45.2-839","catch_line":" Actions for excessive methane","url":"\/45.2-839\/","token":"45.2\/II\/B\/8\/4\/45.2-839","metadata":false},{"id":75918,"structure_id":14031,"section_number":"45.2-840","catch_line":" Crosscuts","url":"\/45.2-840\/","token":"45.2\/II\/B\/8\/4\/45.2-840","metadata":false},{"id":78688,"structure_id":14031,"section_number":"45.2-841","catch_line":" Permanent stoppings","url":"\/45.2-841\/","token":"45.2\/II\/B\/8\/4\/45.2-841","metadata":false},{"id":86254,"structure_id":14031,"section_number":"45.2-842","catch_line":" Ventilation controls","url":"\/45.2-842\/","token":"45.2\/II\/B\/8\/4\/45.2-842","metadata":false},{"id":59441,"structure_id":14031,"section_number":"45.2-843","catch_line":" Line brattice","url":"\/45.2-843\/","token":"45.2\/II\/B\/8\/4\/45.2-843","metadata":false},{"id":70834,"structure_id":14031,"section_number":"45.2-844","catch_line":" Ventilation with air from certain areas","url":"\/45.2-844\/","token":"45.2\/II\/B\/8\/4\/45.2-844","metadata":false},{"id":64318,"structure_id":14031,"section_number":"45.2-845","catch_line":" Worked-out areas","url":"\/45.2-845\/","token":"45.2\/II\/B\/8\/4\/45.2-845","metadata":false},{"id":74385,"structure_id":14031,"section_number":"45.2-846","catch_line":" Air quality","url":"\/45.2-846\/","token":"45.2\/II\/B\/8\/4\/45.2-846","metadata":false},{"id":71388,"structure_id":14031,"section_number":"45.2-847","catch_line":" Examination of mine for explosive gas and other hazardous conditions","url":"\/45.2-847\/","token":"45.2\/II\/B\/8\/4\/45.2-847","metadata":false},{"id":86482,"structure_id":14031,"section_number":"45.2-848","catch_line":" Tampering with methane monitoring devices prohibited; penalty","url":"\/45.2-848\/","token":"45.2\/II\/B\/8\/4\/45.2-848","metadata":false},{"id":66298,"structure_id":14031,"section_number":"45.2-849","catch_line":" Allowing persons to work in mine where methane monitoring equipment disconnected; penalty","url":"\/45.2-849\/","token":"45.2\/II\/B\/8\/4\/45.2-849","metadata":false},{"id":77699,"structure_id":14031,"section_number":"45.2-850","catch_line":" Intentionally bypassing a safety device; prohibition","url":"\/45.2-850\/","token":"45.2\/II\/B\/8\/4\/45.2-850","metadata":false},{"id":68872,"structure_id":14031,"section_number":"45.2-851","catch_line":" Control of coal dust","url":"\/45.2-851\/","token":"45.2\/II\/B\/8\/4\/45.2-851","metadata":false},{"id":79750,"structure_id":14031,"section_number":"45.2-852","catch_line":" Rock dusting","url":"\/45.2-852\/","token":"45.2\/II\/B\/8\/4\/45.2-852","metadata":false}],"previous_section":{"id":61736,"structure_id":14031,"section_number":"45.2-835","catch_line":" Auxiliary fans","url":"\/45.2-835\/","token":"45.2\/II\/B\/8\/4\/45.2-835","metadata":false},"next_section":{"id":81164,"structure_id":14031,"section_number":"45.2-837","catch_line":" Bleeder systems","url":"\/45.2-837\/","token":"45.2\/II\/B\/8\/4\/45.2-837","metadata":false},"metadata":false,"official_url":"https:\/\/law.lis.virginia.gov\/vacode\/45.2-836\/","history_text":"<p>The record of this law\u2019s original creation isn\u2019t available online. It has been modified 13 times. Those modifications are cataloged by \u201cThe Acts of Assembly,\u201d a state publication, by year and chapter. Those modifications that can be read on the General Assembly\u2019s website will be linked accordingly. Those modifications are as follows: in 1954, chapter 191; in 1966, chapter 594; in 1968, chapter 310; in 1976, chapter 598; in 1978, chapter 120; in 1984, chapter 236; in 1985, chapter 448; in 1987, chapter 470; in 1990, chapter 963; in 1993, chapter 442; in 1994, chapter <a href=\"https:\/\/legacylis.virginia.gov\/cgi-bin\/legp604.exe?941+ful+CHAP0028\">28<\/a>; in 1996, chapter <a href=\"https:\/\/legacylis.virginia.gov\/cgi-bin\/legp604.exe?961+ful+CHAP0774\">774<\/a>; in 2005, chapter <a href=\"https:\/\/legacylis.virginia.gov\/cgi-bin\/legp604.exe?051+ful+CHAP0003\">3<\/a>.<\/p>","references":false,"refers_to":false,"permalink":{"id":223579,"object_type":"law","relational_id":78287,"identifier":"45.2-836","token":"45.2\/II\/B\/8\/4\/45.2-836","url":"\/45.2-836\/","edition_id":1,"permalink":0,"preferred":1},"url":"\/45.2-836\/","token":"45.2\/II\/B\/8\/4\/45.2-836","dublin_core":{"Title":" Quantity of air","Type":"Text","Format":"text\/html","Identifier":"\u00a7 45.2-836","Relation":"Code of Virginia"},"html":"\n\t\t\t\t\t\t<section id=\"A\"><p><span class=\"prefix-number\">A.<\/span> The quantity of air passing through the last open crosscut shall be at least 9,000 cubic feet per minute. However, the quantity of air reaching the last open crosscut in a pillar-recovery section may be less than 9,000 cubic feet per minute if at least 9,000 cubic feet of air per minute is being delivered to the intake end of the pillar line. <a id=\"paragraph-280640\" class=\"section-permalink\" href=\"https:\/\/vacode.org\/45.2-836\/#A\"><i class=\"fa fa-link\"><\/i><\/a><\/p><\/section>\n\t\t\t\t\t\t<section id=\"B\"><p><span class=\"prefix-number\">B.<\/span> The air current at a working face shall, under all conditions, have a sufficient volume and velocity to readily dilute and carry away smoke from blasting and any flammable or harmful gases and dust. <a id=\"paragraph-280641\" class=\"section-permalink\" href=\"https:\/\/vacode.org\/45.2-836\/#B\"><i class=\"fa fa-link\"><\/i><\/a><\/p><\/section>\n\t\t\t\t\t\t<section id=\"C\"><p><span class=\"prefix-number\">C.<\/span> In a longwall or shortwall mining system: <a id=\"paragraph-280642\" class=\"section-permalink\" href=\"https:\/\/vacode.org\/45.2-836\/#C\"><i class=\"fa fa-link\"><\/i><\/a><\/p><\/section>\n\t\t\t\t\t\t<section id=\"C1\" class=\"indent-1\"><p><span class=\"prefix-number\">1.<\/span> The quantity of air shall be at least 30,000 cubic feet per minute reaching the working face, unless otherwise approved by the <span class=\"dictionary\">Chief<\/span>; and <a id=\"paragraph-280643\" class=\"section-permalink\" href=\"https:\/\/vacode.org\/45.2-836\/#C1\"><i class=\"fa fa-link\"><\/i><\/a><\/p><\/section>\n\t\t\t\t\t\t<section id=\"C2\" class=\"indent-1\"><p><span class=\"prefix-number\">2.<\/span> The velocity of air provided to control dust at designated locations on the longwall or shortwall face shall be maintained in accordance with the provisions of the mine ventilation plan approved by MSHA. <a id=\"paragraph-280644\" class=\"section-permalink\" href=\"https:\/\/vacode.org\/45.2-836\/#C2\"><i class=\"fa fa-link\"><\/i><\/a><\/p><\/section>\n\t\t\t\t\t\t<section id=\"D\"><p><span class=\"prefix-number\">D.<\/span> Ventilation shall be maintained during the installation or removal of mechanized mining equipment. <a id=\"paragraph-280645\" class=\"section-permalink\" href=\"https:\/\/vacode.org\/45.2-836\/#D\"><i class=\"fa fa-link\"><\/i><\/a><\/p><\/section>","plain_text":"                                 CODE OF VIRGINIA\n\n QUANTITY OF AIR (\u00a7 45.2-836)\n\nA. The quantity of air passing through the last open crosscut shall be at least\n9,000 cubic feet per minute. However, the quantity of air reaching the last open\ncrosscut in a pillar-recovery section may be less than 9,000 cubic feet per\nminute if at least 9,000 cubic feet of air per minute is being delivered to the\nintake end of the pillar line.\n\nB. The air current at a working face shall, under all conditions, have a\nsufficient volume and velocity to readily dilute and carry away smoke from\nblasting and any flammable or harmful gases and dust.\n\nC. In a longwall or shortwall mining system:\n\n   1. The quantity of air shall be at least 30,000 cubic feet per minute reaching\n   the working face, unless otherwise approved by the Chief; and\n\n   2. The velocity of air provided to control dust at designated locations on the\n   longwall or shortwall face shall be maintained in accordance with the\n   provisions of the mine ventilation plan approved by MSHA.\n\nD. Ventilation shall be maintained during the installation or removal of\nmechanized mining equipment.\n\nHISTORY: Code 1950, \u00a7\u00a7 45-4.1, 45-9, 45-12, 45-60.4, 45-74; 1954, c. 191;\n1966, c. 594, \u00a7\u00a7 45.1-5, 45.1-56; 1968, c. 310; 1976, c. 598; 1978, c. 120;\n1984, c. 236; 1985, c. 448; 1987, c. 470; 1990, c. 963; 1993, c. 442; 1994, c.\n28, \u00a7 45.1-161.219; 1996, c. 774; 2005, c. 3; 2021, Sp. Sess. I, c. 387.","edition":{"id":1,"name":"2025","slug":"2025","date_created":"2026-06-21 22:39:22","date_modified":"2026-06-21 22:39:22","current":1,"order_by":1,"last_import":null}}