Database fields, all categories

Site identification
	`dep_id`	A unique 12-digit system generated sequence number which references records of information pertaining to a mineral property
	`mrds_id`	Identification number used to refer to this entry in the Mineral Resources Data System, if the record appeared in that database.
	`mas_id`	Identification number for this site as it appeared in the Mineral Availability System/Mineral Industry Locator System database,
	`site_name`	Current (preferred) form of the name of the site, deposit, or operation to which the record refers.
	`names`	Names by which the site or operation has bee known in the past.
Geographic location
	`latitude`	Geographic latitude of the site, WGS84
	`longitude`	Geographic longitude of the site, WGS84
	`region`	Code indicating the geographic region
	`country`	Name of the country in which the site is located
	`state`	Name of the state or province in which the site is located
	`county`	Name of the county in which the site is located
Site characteristics
	`oper_type`	Type of operation existing or proposed at the site.
	`dep_type`	General type of deposit or resource present at the site.
	`prod_size`	A broad characterization of the magnitude of production at the site.
	`dev_stat`	Status of development of the resource or operation.
	`ore`	Name of the ore mineral or material found in this deposit.
	`gangue`	Name of the gangue mineral or material found in this deposit.
	`other_matl`	Name of other minerals or materials found in this deposit.
	`orebody_fm`	Form and shape of the ore body.
	`work_type`	General type of workings at the site.
	`model`	Mineral deposit models that characterize the site. Multiple models are delimited by braces, with a model number for each.
	`alteration`	Geochemical alteration, if any, believed to have been important in forming or modifying the ore materials of a deposit.
	`conc_proc`	Geological processes that are believed to have occurred to concentrate ore materials in the deposit
	`ore_ctrl`	Geologic features, typically structural, that exert control over the form, extent, or character of the deposit.
	`reporter`	Names of the persons primarily responsible for entering information about the site.
	`hrock_unit`	Lithologic and stratigraphic information regarding the host rocks for the ore deposit
	`hrock_type`	Controlled term(s) indicating the type of host rocks, taken from Lithclass 6.2
	`arock_unit`	Lithologic and stratigraphic information regarding the rocks for the ore deposit that are not specifically identified as host ro
	`arock_type`	Controlled term(s) indicating the type of associated rocks, taken from Lithclass 6.2
	`structure`	Description of geological structures at or near the deposit.
	`tectonic`	Description of tectonic setting within which the deposit is found, includes regional geologic structure.
	`ref`	Bibliographic references providing information supporting the database record. Braces delimit multiple references.
	`yfp_ba`	Value < indicates production first began before the year specified in YR_FST_PRD; > indicates production began after that year.
	`yr_fst_prd`	Year of first production at the site. May be modified by YFP_BA.
	`ylp_ba`	Value < indicates production ended before the year specified in YR_LST_PRD; > indicates production ended after that year.
	`yr_lst_prd`	Year of last production at the site. May be modified by YLP_BA.
	`dy_ba`	If present, < in this field indicates that discovery occurred prior to the value in DISC_YR; likewise > indicates discovery occu
	`disc_yr`	Year the site was discovered. The value of DY_BA may modify the meaning of this value.
	`prod_yrs`	Description of the production history, including breaks or interruptions between first and last production years.
	`discr`	Name and address (if known) of the company, organization, or person most closely associated with the discovery of the resource.
Commodities
	`com_type`	Type of commodities present: metallic (M), non-metallic (N), or both (B)
	`commod1`	Primary commodities present, a comma-separated list. Commodity qualifiers follow each commodity, delimited by a hyphen.
	`commod2`	Secondary commodities present, a comma-separated list. Commodity qualifiers follow each commodity, delimited by a hyphen.
	`commod3`	Other commodities present, a comma-separated list. Commodity qualifiers follow each commodity, delimited by a hyphen.