Ministry of Energy, Mines and Natural Gas and Responsible for Housing
News | The Premier Online | Ministries & Organizations | Job Opportunities | Main Index

MINFILE Home page   ARIS Home page MINFILE Search page   Property File Search
Help Help
New Window
File Created: 24-Jul-85 by BC Geological Survey (BCGS)
Last Edit:  24-Jun-13 by George Owsiacki(GO)

Summary Help Help

NMI 104J16 Gem1
Name SEYWERD, SEYWERD CREEK, GREENGOLD, DYNASTY JADE, EMPRESS JADE Mining Division Liard
BCGS Map 104J080
Status Past Producer NTS Map 104J16E
Latitude 58º 46' 29" N UTM 09 (NAD 83)
Longitude 130º 05' 13" W Northing 6515477
Easting 437147
Commodities Jade/Nephrite Deposit Types Q01 : Jade
Tectonic Belt Intermontane Terrane Cache Creek
Capsule Geology

Late in the summer of 1963, a large nephrite boulder was found on the roadside where a culvert had been built for Seywerd Creek beneath the Cassiar-Stewart highway (Highway 37). The creek flows into Dease Lake at Sawmill Point, near the lakes north end. Nephrite (jade) boulders were found in considerable quantity along the creek for more than 1.6 kilometres east of the road.

Rocks exposed along the creek are dominantly argillites and greywackes of the Mississippian-Triassic Kedahda Formation (Cache Creek Complex). There are also outcrops of Cache Creek Complex serpentinite a short distance south of the creek, which are upper Mississippian-Permian age.

Numerous nephrite boulders, some up to 4.5 tonnes in weight, have been found in the creek. Quality of the material in most instances is difficult to judge from the exposed surfaces, so as a consequence each boulder is initially sampled by breaking a slab along a sawcut 15 to 25 centimetres deep made with a portable diamond saw. Although some nephrite is sheared, and some have inclusions of magnetite or is mottled, some material of very good colour has been found (Minister of Mines Annual Report 1965, page 250).

In 1965, a number of boulders were cut into slabs and shipped; about 1.8 tonnes of jade were sold in West Germany and about 3.1 tonnes in Japan. In 2006, prospecting was conducted on behalf of Dynasty Jade Ltd. following up local stories of exposed jade boulders in creeks. The two major creeks explored were Saw Mill Creek and Dorthy Creek.

Bibliography
EMPR AR 1963-151; *1965-250
EMPR PF (104J General File - Claim map 73M, Dec. 1970)
EMPR ASS RPT 28639
EMPR OF 1996-11
GSC BULL 504
GSC MAP 9-1957; 21-1962; 1418A; 1712A; 1713A
GSC SUM RPT 1925, Part A, pp. 33A-99A
GSC P 68-48
GSC OF 707; 2779

COPYRIGHT | DISCLAIMER | PRIVACY | ACCESSIBILITY