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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  07-May-2020 by Karl A. Flower (KAF)

Summary Help Help

NMI 103P6 Mo2
Name ROUNDY CREEK, SUNSHINE CREEK Mining Division Skeena
BCGS Map 103P043
Status Developed Prospect NTS Map 103P06W
Latitude 055º 24' 49'' UTM 09 (NAD 83)
Longitude 129º 29' 32'' Northing 6140929
Easting 468838
Commodities Molybdenum Deposit Types L05 : Porphyry Mo (Low F- type)
Tectonic Belt Intermontane Terrane Stikine, Bowser Lake
Capsule Geology

The Roundy Creek deposit is located about 6.0 kilometres south of Alice Arm. This deposit has been extensively explored in the past for its molybdenum mineralization, resulting in the definition of several zones containing moderate reserves.

The deposit consists of a small elongate sheet-like Eocene quartz monzonite stock of the Alice Arm Plutonic Suite that intrudes a folded sequence of Middle Jurassic to Upper Cretaceous Bowser Lake Group argillite and greywacke. The enclosing sediments have been metamorphosed to biotite hornfels for about 200 metres outward from the stock. These rocks are all cut by narrow, northeast striking, steeply dipping hornblende and biotite lamprophyre dikes.

The stock is made up of a core of leucocratic quartz-eye porphyritic quartz monzonite that grades outwards into a shell of biotite quartz monzonite. It is cut by irregular masses and dikes of alaskite and is segmented by several northwest-striking faults along, and adjacent to, Roundy Creek. A potassic alteration zone of abundant sericite and biotite-coated fractures are developed in the stock. This zone occurs within and marginal to higher grade molybdenite mineralization.

The stock hosts three lens-like zones of molybdenite mineralization. An eastern zone contains uniform grades of molybdenite which occurs as selvages in numerous randomly orientated quartz veinlets and as fracture infillings.

Along and south of Sunshine Creek, a tributary of Roundy Creek, alaskite hosts bands and rosettes of molybdenite in the central and southern portions of the stock. The bands are 1 to 2 centimetres wide and the uniformly distributed rosettes are 1.0 centimetre in diameter.

In addition, molybdenite occurs in randomly oriented fractures with chlorite, and in closely spaced 0.5 to 1.0 centimetre wide quartz veinlets in alaskite and quartz-eye porphyritic quartz monzonite.

Indicated reserves at Roundy Creek are 7.0 million tonnes grading 0.06 per cent molybdenum (grade given was 0.11 per cent MoS2); indicated reserves at Sunshine Creek are 1.35 million tonnes grading 0.20 per cent molybdenum (grade given was 0.347 per cent MoS2); indicated reserves at High-Grade are 35,000 tonnes grading 0.40 per cent molybdenum (grade given was 0.668 per cent MoS2); conversion to Mo for all zones using a factor of 1.6681 (CIM Special Volume 15 (1976), page 467).

Avanti Mining Inc. released updated resources for the Roundy Creek property as part of a feasibility study for the Kitsault project (Avanti Mining Inc. News Release February 5, 2013):


Sunshine and Sunlight Area Tonnage Mo

Category (million tonnes) per cent

Indicated 1.94 0.109

Inferred 0.33 0.079

Roundy Area

Inferred 4.32 0.073

(0.022 per cent Mo cut-off)


EMPR AR 1916-66; 1921-48; 1930-87; 1960-10; *1964-24-30,36-39; 1965-62,63; 1966-48; 1967-43; 1968-61-63
EMPR BULL *63, pp. 103-105
EMPR INF CIRC 2011-1, p. 13
EMPR FIELDWORK 1985, pp. 219-224; 1988, pp. 233-240; 1990, pp. 235-243; 2005, pp. 1-4
EMPR GEM 1969-68; *1970-91-94; *1971-122,123
EMPR MAP 8; 65 (1989)
EMPR OF 1986-2; 1992-1; 1994-14
EMPR PF (Carter, N.C. (1965): Report; Silurian Chieftain, Annual Reports 1965, 1968; Quinn, H.A. (1966): Report for Apollo Minerals; Various maps and sections; *Woodcock, J.R., Carter, N.C. (1976): Paper 46)
EMR MIN BULL MR 223 B.C. 306
EMR MP CORPFILE (Silurian Chieftain Mining Co. Ltd.; Bethlehem Copper Corp. Ltd.)
EMR MP RESFILE (Roundy Creek)
GSC MAP 307A; 1385A
GSC SUM RPT 1922 Part A, p. 33
GSC OF 864; 3272
CIM Special Volume 15, pp. 466,467
GCNL #74, 1980
N MINER Aug.8, 1974
PR REL SNL Enterprises Ltd., Apr.8,20, 2005; Avanti Mining Inc. Nov.*23, 2010; Feb.5, 2013
Silversides, D.A. (1961): University of British Columbia M.Sc. Thesis
Volk, J. (2009-01-23): Amended NI 43-101 Technical Report on Resources - Kitsault Molybdenum Property
Volk, J. (2009-03-03): NI 43-101 Preliminary Economic Assessment - Kitsault Molybdenum Property
Grills, F. (2009-12-15): NI 43-101 Pre-feasibility Study – Kitsault Molybdenum Property
Christie, G., Thomas, D.G.(2013-02-04): NI 43-101 Technical Report on Updated Feasibility Study
Piésold, K. (2014-03-14): Kitsault Molybdenum Project British Columbia, Canada NI 43-101 Technical Report