Scrubby Gully is located on the western side of The Torrington Pendant, where the Mole Granite intrudes the overlying sedimentary rocks. In many places the boundary is notable for the presence of silexite, essentially a topaz-quartz rock. See especially my earlier blog entry “Torrington – Essential Reading” as well as the various references mentioned in the blogs on downloading from DIGS and the ALF site.
Scrubby Gully may be reached by following the Butler Mine road and then the Mystery Face road, which branch to the left several kilometres north of Torrington from the Silent Grove road. At the Mystery Face car park, the fence directly ahead marks the boundary between the Conservation Area and private property. Follow the fence to the left for 15-20 minutes until it descends into Scrubby Gully. The alluvial areas are marked by hatching on the adjoining map. (The Scrubby Gully Mine shown is a bismuth/tungsten/lead deposit.)
To the right (upstream) are the Scrubby Gully alluvial workings, dating from the 1870’s and 80’s. Large quantities of “tin” (cassiterite) were extracted from here and from the gully below (downstream of the boundary fence). From the 1960’s until now fossickers have visited this area in search of topaz, especially the sky blue variety, for which the locality is well known.
For details of the geology of the diggings, see TWE David’s 1887 memoir on the Vegetable Creek Tin Mining Field (pages 71 and 164 especially. This can be downloaded from DIGS. The Minerama books on Topaz and Beryl also contain useful information.
Any place where sediment is accumulating in holes and cracks is worth investigating for these gems. Remember that beryl is not a dense mineral and does not concentrate in the sieve centres as the other minerals mentioned do.
|Typical topaz producing crack|
|A good trap|
Check my fossicking videos from around Glen Innes here . I also have playlists on Glen Innes, the Blue Mountains and New Zealand.
https://johnsbluemountainsblog.blogspot.com/2013/12/links-to-all-blog-entries-and-relevant.html All Blue Mountains blogs and videos
All New England and other Geology blogs and videos
|The writer digging for topaz at Scrubby Gully 1998|
|A few good finds|
|Some choice Scrubby Gully topaz|
|Beryl crystal from Scrubby Gully|