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MILO-2, Mineral Information Layer for Oregon (MILO) - release 2, by Clark A. Niewendorp and Ronald P. Geitgey, Oregon Department of Geology and Mineral Industries

Disclaimer: Mining sites are included for informational purposes only and should not be used to infer acceptable or permitted land use actions. Interested parties should contact their local land use authority to verify zoning and applicable land use ordinances. Respect the rights of private property owners. Understand that recreation in or around inactive mine sites is extremely dangerous and can result in serious injury or death. Stay out and stay alive! No warranty expressed or implied is made regarding the accuracy or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data. We also urge you to pay careful attention to the contents of the metadata file associated with these data and to the compilation process and limitations described therein. The Oregon Department of Geology and Mineral Industries shall not be held liable for improper or incorrect use of the data described and/or contained herein. Data are not intended for site-specific investigations.

Download MILO-2 (9 MB .zip file) | interactive map (subset of MILO-2 data)

small MILO-2 map

Publication Contents
All data are grouped into three folders: "Shp," "Metadata," and "Spreadsheet". No text report accompanies the database. Please read the metadata for data on the data.

Also included are:

What is the Mineral Information Layer-Release 2 for Oregon?
The Oregon Department of Geology and Mineral Industries (DOGAMI) is publishing the Mineral Information Layer for Oregon (MILO-Release 2) database in its Digital Data Series. MILO-Release 2 is the definitive database for information about Oregon's mineral occurrences, prospects, and mines and includes a new map-based way to access and search the database. The data set contains information for the following commodities: metals (elements, metallic, and oxides), industrial minerals (non-metallic minerals and materials, including gemstones), mineral fuel (coal and oil shale), and aggregate (sand & gravel and stone).

MILO-Release 2 updates Oregon's mineral resource inventory and integrates the results into a comprehensive spatial database. Its goal is two-fold: 1) to be the primary way in which the State of Oregon extracts, researches, and displays its available historic mining and mineral resource information and 2) to provide reference material supporting mineral resource and environmental assessments on local- to statewide-scale.


The predecessor and foundation for this release is the database called MILOC (Mineral Information Layer for Oregon by County). DOGAMI published the database in 1993 to provide the state with a mineral resource database (Gray, 1993). It was subsequently converted to a GIS format and renamed MILO (also known as MILO-Release 1). However, DOGAMI did not release the first version of MILO to the public.
MILOC was originally published in dBASE III+ format, within which was information for location, commodity, and other data for an estimated 7,899 mineral occurrences, prospects, and mines. MILO-Release 2 lists 21,101 mineral occurrences, prospects, and mines. As in MILOC, these sites are linked to available commodity information such as metals (elements, metallic, and oxides), industrial minerals (non-metallic minerals and materials, including gemstones), mineral fuel (coal and oil shale), and construction aggregate (sand & gravel and stone). The substantial increase in sites, nearly three-fold, can be attributed partly to data "pulls" from the following sources:

Impact/Technical Merit
MILO-Release 2 serves not only as a source of Oregon's important mineral background information, but also (1) facilitates study of potential mineral resource; (2) enhances our ability to test hypotheses using GIS analysis; and (3) supports modeling, such as efforts to locate "hidden" hydrothermal systems. MILO-Release 2 is also relevant for anyone interested in environmental studies in Oregon, including researchers, developers, and policy makers.

MILO-Release 2 answers the fundamental question: where are mineral resources found in Oregon? It also supports hazard studies because certain undesirable health outcomes are known to be associated with long-term exposure to a variety of different naturally “occurring” minerals and their compounds e.g., asbestiform asbestos. If disturbed, crushed, or exposed to natural weathering and erosion, or to human activities that create dust, these minerals and/or compounds could pose a potential risk to human health.

Many DOGAMI geologists and reporters have contributed to the present understanding of Oregon's mineral wealth. This release of MILO owes much of its utility to Jerry Gray, a former economic geologist of DOGAMI.
Funding for MILO-Release 2 project was provided by a grant obtained from the Oregon Department of Transportation (ODOT) through the Federal Highway Administration (FHWA) Contract/Grant No. 686; Interagency Agreement between ODOT and DOGAMI, No. 25296. Agencies that provided data for the original MILOC (and the foundation for this release) include: Bureau of Land Management (BLM), U.S. Bureau of Mines (USBM), U.S. Forest Service (USFS), U.S. Geological Survey (USGS), Oregon Department of Energy, Oregon Department of Forestry, Oregon Department of Land Conservation and Development, Department of State Lands, Oregon Department of Transportation-Highway Division, and Oregon Department of Water Resources. Also, this data set integrates selected data from DOGAMI's unpublished and published mineral resource reports and maps, accuracy of which varies according to the original source(s). Likewise the accuracy of the other sources varies or is entirely unknown.

Gray, J.J., 1993, Mineral Information Layer for Oregon by County: Oregon Department of Geology and Mineral Industries Open-File Report O-93-08, 18 p.
U.S. Geological Survey, 2005, Mineral Resources Data System, Mineral Resources On-line Spatial Data: