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GUIDELINES FOR USING THIS REPORT <br />The maps reflect the extent of mining outlines, mine names and specific features unique to the mines. <br />To learn more about a mine, or the features noted on the map, the mine name or closest mine to a <br />feature can be referenced in Table One. Additionally, Table One contains information such as alternate <br />mine names, dates that mining occurred and depths of mining. Unique features noted on the map or in <br />Table One can in turn be found in Table Two under that mine name. The Tables are organized <br />alphabetically by primary mine name. In most cases this name is the most recent name under which <br />production took place. However, in some cases, a particular mine name in use for a longer time period <br />is more applicable and is used as the primary mine name. An index for cross referencing mine names is <br />located after each county section. <br />Mines which are unnamed and unlabeled also appear on the maps. When basic data or unique information <br />is available for these mines they are labeled and noted on the tables. Conversely, in many cases mines <br />are found in the records, named and unnamed, whose locations are unknown. In some cases the USGS base <br />map will show mine openings or name specific mines which could not be located or substantiated in the <br />Colorado coal mine records. In these cases the mines were lot listed in the Tables nor in our map <br />compilation. <br />Gaps in the information found in Table One reflect a lack of mine information in the existing <br />literature. An example of inconsistency in Table One is the depth of mining data. Unfortunately, this <br />information is missing from the Colorado Division of Mines' records for many mines. <br />Much of the early underground coal mining that has taken place in Colorado occurred during an era in <br />Colorado's history when record keeping was poor. Mine surveys may not have been correctly tied to <br />present day survey monuments; maps and records have been lost; or in some cases mine records were <br />neither initiated nor sent to the state. These factors contribute to inaccuracies in the extent of <br />mining and results in "lost" mines. Although, a great deal of effort has been made to make these maps <br />as accurate as possible, it is important to note that there are mines whose locations remain unknown. <br />Additionally, non-coal mines such as underground clay mines are not listed in the tables or on the <br />maps. <br />-4- <br />