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<br />
<br />PART ONE
<br />
<br />AREAS IN WHICH DEVELOPMENT IS PROHIBITED
<br />
<br />A. MINERAL RESOURCE AREAS
<br />
<br />It is in the i nteres t of the County and Sta te to ma i nta in, for purposes of future
<br />mineral extrac~ion, those areas havlng mlneral deposits of commercial value.
<br />
<br />Such areas arp defined herein as Mineral Resource Areas (MRA's). For purposes of
<br />definitio~, a 1,1RA is described as follows:
<br />
<br />".. .an area in which minerals are located in sufficient concentration in
<br />veins, deposits, bodies, beds, seams, fields, pools, or otherwise, as to
<br />be capable of economic recovery. The term includes but is not limited to
<br />any area in which there has been significant mining activity in the past,
<br />there is significant mining activity in the present, mining development
<br />is planned or in progress, or mineral rights are held by mineral patent
<br />or valid mining claim with the intention of mining."*
<br />
<br />\~ith changing market conditions, as well as advances in technology, certai,n portions
<br />of the study area may contain minerals of a commercial value. While the extent of or
<br />value of such probable and possible reserves are unknown, it is in the County's in-
<br />teres t to requi re a geo 1 ogi c report by a qua 1 i fi ed geo 1 ogi s t of the potenti a 1 pri or +()
<br />permitting anv land use change,
<br />
<br />The concern as described above is based upon the following statement:
<br />
<br />"In areas of past mining activities, possible ores may be present as un-
<br />discovered, unanticipated deposits or as anticipated deposits that were
<br />unevaluated or noneconomic at the time of mining. With renewed interest
<br />in some of the old mining districts, possible reserves may be discovered
<br />and reclassified to probable reserves. In areas of present mining, possi-
<br />ble ores are reasonably thought to exist, but their grade and tonnage can-
<br />not he practicably determined."**
<br />
<br />rile Evans (}ulch area has been extensively mined to include the fOllowing minerals:
<br />silver, lead, hismuth, manganese, zinc, cadmium, barium, sulfur, flourspar, pyrite,
<br />J imestone ~nd dolmite. Tungsten, gold, copper and iron have been mined in an area
<br />between Yankee Hill and Ball Mountain.
<br />
<br />As such, Evans Gulch, South Evans Gulch and the northwest portion of Iowa Gulch
<br />may contain mineral deposits which were overlooked or discarded as waste material.
<br />
<br />B, GEOLOGIC HAZARD AREAS
<br />
<br />It is in the interest of the pUblic to prohibit development of a residential char-
<br />acter where geologic hazards are known or thought to exist. A geologic hazard is
<br />defined by H.B. 1041 as follows:
<br />
<br />"Geolo(Jic Hazard means a geologic phenomenon which is so adverse to past, ,',
<br />currert, or foreseeable construction or land use as to constitute a sig-
<br />nificant hazard to public health and safety or to property."
<br />
<br />In general, development shall not be permitted in a geologic hazard area which would
<br />SUbject occllpants or users of the area to hazardous conditions and create or worsen
<br />such hazardous conditions. Any development permitted in a geologic hazard area shall
<br />he so engineered as to mitigate the hazard. As such, many potential geologic hazards
<br />can be mitigated by engineering pi actices and careful site planning.
<br />
<br />*Source:
<br />**Source:
<br />
<br />H.B. 1041 (106-7-104)(11)
<br />SpEcial Publication No.6 "Guidelines and Criteria for Identification and
<br />Land Use Controls of Geologic Hazard and Mineral Resource Areas, 1974 p. 81
<br />
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