Notes to Accompany Northeast B.C. - Southern Half
Digital Geological Compilation, Open File 1995-24


1.  PROJECT OVERVIEW
The geological compilation of Northeast BC - Southern Half was conducted as part of the 
Geological Survey Branch's Mineral Potential Project.  Funding for this project was partly 
provided by the Corporate Resource Inventory Initiative (CRII).  The digital map included 
with this release illustrates the distribution of geologic units within the project area.  This 
compilation does not contain attitudinal data.

2.  PROJECT LOCATION AND AREA COVERED
The area covered by the Northeast BC - Southern Half release is shown on the page size 
map included with the disks.  It includes the following NTS mapsheets:
	83D	83E	93F	93G	93H	93I
	93J	93K	93N	93O	93P

3.  SCALE OF COMPILATION
This compilation was made at 1:100,000 scale for use at 1:250,000.  Linework cannot be 
considered accurate at scales larger than 1:100,000.

4.  SOURCES OF DATA
The compilation was made from published and unpublished mapping by the B.C. 
Geological Survey Branch and the Geological Survey of Canada.  Additional information 
was obtained from Scientific Journals, Assessment  Reports, Theses, and GSB Property 
Files.  No new mapping was undertaken.  Included in digital (SOURCE.TXT) and hard 
copy form is a list of all sources of information used in compiling the Northeast BC - 
South Half geological maps.

5.  PROJECT TEAM
The geology of the area was compiled by Kim Bellefontaine (93F ,K ,N), Andrew Legun 
(82D, E, 93H, I, O, P) and Nick Massey (93G, H, J, O) of the B.C. Geological Survey 
Branch between April 1994 and January 1995.  Digital compilation and editing was done 
by Patrick Desjardins, Kim Bellefontaine and Don MacIntyre between November 1994 
and March 1995.

6.  BASE MAP INFORMATION
	Source:	Ministry of Environment, Lands & Parks
	Type:		Restructured 1:250,000 digital topographic maps (TRIM format)
	Datum:	North America Datum, 1983
	Projection:	Universal Transverse Mercator
	Zone:		10 and 11
Lakes, islands and the NTS map grid are provided with this release. Complete digital files 
with planimetry, contours and a DEM can be purchased from:
	Maps - B.C.,
	Ministry of Environment, Lands and Parks,
	3rd Floor, 1802 Douglas Street,
	Victoria, B.C. V8V 1X4
	Phone:	(604) 387-1441
	Fax:	(604) 387-3022

7.  LIST OF FILES INCLUDED WITH THIS RELEASE
The following files are contained on the six disks that are included with this open file 
release.  When the data is brought into a GIS system you should be able to build a 
topology and create links to the ASCII attribute tables.  You may have to convert these 
ASCII tables to the format required by your GIS.  These files have been exported from a 
topologically structured map created by our TERRASOFT GIS system.  The line work is 
clean and all polygons are closed.  However, we do not guarantee you will be successful in 
creating a topology in any system other than TERRASOFT.  Much will depend on the 
flexibility of your system and how well it can import DXF data.

List of files (uncompressed) on Disk #1
File Name	Size(bytes)		Comments
================================================================
READ.ME		 9764		ASCII text file, this file
PKUNZIP.EXE	28959		Executable file to uncompress files,
				  see note below (8)
================================================================
2 files		38723 bytes

List of compressed files in NEBC.ZIP contained on Disks 1 to 5
================================================================
Legend and Source TXT digital files and their size after decompression:
SOURCE.TXT	67926		ASCII text file, see note above (4)
LEGEND.TXT	46192		ASCII text file, see note below (11)
	
2 files		114118 bytes

Geological Map DXF digital files and their size after decompression:
83DENE.DXF		1300798
93FNE.DXF		1673684
93GNE.DXF		1064463
93HNE.DXF		2891562
93INE.DXF		5109715
93JNE.DXF		2186121
93KNE.DXF		2839382
93NNE.DXF		3692060
93ONE.DXF		3540405
93PNE.DXF		2128935
	
10 files		26427125 bytes

Polygon TXT digital files and their size after decompression
83DENE.TXT		 8449
93FNE.TXT		 7051
93GNE.TXT		 4401
93HNE.TXT		21901
93INE.TXT		35951
93JNE.TXT		14151
93KNE.TXT		12801
93NNE.TXT		20451
93ONE.TXT		23651
93PNE.TXT		13401
	
10 files		162208 bytes

Plot digital files and their size after decompression
83NEPLOT.PLT		  796335 bytes		Colour plot file, see note below (12)
93NEPLOT.PLT		13187762 bytes		Colour plot file, see note below (12)
================================================================
24 files in NEBC.ZIP	40687548 bytes
26 files in total	40726271 bytes

8.  HOW TO DECOMPRESS AND LOAD THE FILES
To decompress the files contained in NEBC.ZIP copy PKUNZIP.EXE (included on Disk 
#1) to the directory where you want to install the files.  At the DOS prompt type 
PKUNZIP A:NEBC.  You should be asked to insert the last disk of the set (Disk #5), then 
insert the disks in order from 1 to 5.  This will unzip the entire file NEBC.ZIP and copy 
the files listed above to your hard disk.  WARNING:  You will need at least 41 
megabytes of free disk space for the files.  If you would like to decompress only specific 
files type PKUNZIP A:NEBC FILENAME(S).  This command will decompress only the 
files you selected.  To view other options of the PKUNZIP program type PKUNZIP at the 
DOS prompt.

9.  LAYER NAMES IN DXF FILES
Data obtained from the Ministry of Environment, Lands and Parks 1:250,000 restructured 
digital base map series (TRIM format, NAD 83) 
	Name			Contents
	==========================================================
	GB_LAKES		Major lakes
	GE			Islands
	RG500			Map sheet boundaries for 1:50,000 NTS maps
	==========================================================
Data digitized by the B.C. Geological Survey Branch (Kim Bellefontaine, Patrick 
Desjardins and Don MacIntyre)

	LAYERS USED TO DEFINE POLYGON BOUNDARIES
	Name			Contents
	==========================================================
	CONTACT		Boundaries of geological units; stratigraphic or intrusive
	FAULT_CONT	Faults that separate different lithologies
	T_FAULT_CO	Thrust faults that separate different lithologies
	QUAT_CONT	Quaternary surficial cover that define polygons
	NEATLINE	Limit of 1:250,000 mapsheets
	LAKE_POLY	Lakes that define polygons
	==========================================================

	LAYERS NOT USED TO DEFINE POLYGONS
	Name			Contents
	==========================================================
	FAULT		Faults that separate similar lithologies
	T_FAULT		Thrust faults that separate similar lithologies
	QUAT		Approximate limit of Quaternary surficial cover
	TEXT		Labels for map units (as in legend.txt) and geologic text
	POLY_ID		Database key
	==========================================================
Depending on the type of computer system being used, thrust fault symbols (called teeth1) 
may have to be scaled.

10.  FIELD NAMES IN TXT FILES
	Name		     Column Width	Contents
	==========================================================
	KEY (POLY_ID)		16		A unique number for each polygon; used to
						  link database
	EASTING			10.2		UTM Easting coordinates
	NORTHING		10.2		UTM Northing coordinates
	MAPCODE			10		Code used for the map unit
	==========================================================


11.  MAP LEGEND
The LEGEND.TXT file contains an abbreviated legend for the digital geological 
compilation maps.  The ASCII comma delimited format allows for its import into a 
suitable database or spreadsheet program. It can then be used as an attribute file within a 
GIS. A hardcopy legend is also included with this release.
	The legend.txt file consists of the following eight data fields:
	==========================================================
	MAPCODE:			The code used for the map unit
	AGE:				Age range of the map unit
	GROUP:				Stratigraphic group name
	FORMATION:			Stratigraphic formation name
	NAME				Informal name
	DESCRIPTION:			Description of the map unit
	TECTONIC ELEMENT:		Terrane assignment and/or tectonic element
	COLOUR:				Colour assigned to HP650C colour plotter
	==========================================================

12.  PLOT FILE
The plot files 83NEPLOT.PLT and 93NEPLOT.PLT are colour plot files that can be 
taken to a commercial plotter to produce a draft colour map.  For HP650C colour plotters 
the settings should be:
		Plotter Setup:		Lang=7586, HP-GL/2
		Pen Settings:		Pallette=Software.
The plot files were generated at a scale of 1:400,000.  Also included with this release are 
black and white hard copies of the same plots.  These plots (digital and hard copy) are 
provided only as a sample of the data.  They are not at a sufficient scale for easy legibility.

13.  DISCLAIMER
Although only the most current data available was used in this compilation, the quality of 
data produced by sources other than the B.C. Geological Survey Branch is unknown.  The 
user should be aware that there was very limited information available for large parts of 
the map area and the reliability of the location of geologic contacts in these areas is 
questionable.  Please consult the original data sources if there is concern with the quality 
of data.

14.  CONTACT PERSON
If you have any problems or would like to contribute additional information please 
contact:
	Kim Bellefontaine
	B.C. Ministry of Energy, Mines & Petroleum Resources
	Geological Survey Branch
	5th Floor, 1810 Blanshard St.
	Victoria, B.C.
	V8V 1X4
	Phone:	952-0410
	FAX:	952-0381
	E-MAIL   kimb@mp.gsb.empr.gov.bc.ca