SPECIMEN HILL, THE GULF, NEAR EMMAVILLE
NSW AUSTRALIA
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| The mine location is marked at top centre (Mindat) |
I’m sorry to say that I have never visited this old mining
area, which is along the Carpet Snake
Creek fire trail, off the Gulf road, north-west of the New England mining
town of Emmaville. It is one of many
hundreds of mineral deposits in the area, mostly discovered in the period
1875-1900.
Mindat (here) provides the following location information:
Latitude
& Longitude (WGS84):
|
29° 16' 35'' South , 151° 31'
4'' East
|
Latitude
& Longitude (Decimal Degrees):
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-29.2763888889 , 151.517777778
|
Latitude
& Longitude (Degrees plus Decimal Minutes):
|
-29° 16.5833333333', 151°
31.0666666667'
|
The workings are on the right hand side of the fire trail
about 1km from the Gulf road turnoff, which is on the right not far after the ford
across Paradise Creek. Be aware that the access road is not likely to be OK for
2 WD vehicles.
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Here are some useful references: Geo-Log 2011 page 64 (here). Geo-Log is an e-zine put out by the
Hunter Valley Amateur Geological Society and the whole of it is packed with
useful information.
The Mindat article also provides a list of reported minerals from this
location: Beryl, var Emerald, 'Biotite', Cassiterite,
'Chlorite Group', Epidote, 'Feldspar Group', Fluorite, 'Monazite', Muscovite’ var: Sericite, Pyrite, Quartz, 'Tourmaline', 'Wolframite'. The quote marks imply that that a mineral group
rather than a precisely named mineral species is intended. (The blue colour has to do with links in Mindat which I haven't been able to change.)
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| Quartz crystal tips (Jewellery Pirate) |
Also noteworthy is the inclusion in the article of
a photograph of an emerald crystal, which is so typical of those found at the
Torrington emerald mine (Cow Flat) that I am certain the specimen came from
there rather than from Specimen Hill. To my knowledge, no-one has recorded
finding emerald or even beryl at this place. I will gladly change this blog if
someone can tell me otherwise.
Note that the Grafton
metallogenic map (an extract is shown below) locates Sim’s Deposit
(EA0336), Farmer’s Deposit
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| Enlarged from the Graton Metallogenic map |
(EA0338), the Breakfast Creek Deposit (EA0022) and
the Breakfast Creek Alluvials (EA0783) in this area. Several of these (like
Specimen Hill itself (EA0335)) are lodes, the others are alluvial. This means
that if you are visiting the area, seek out these lesser known spots and in
particular do some gem sieving in the gullies – topaz and monazite as well as
cassiterite and quartz crystals could be waiting for you. Pretty Gully is to
the west of Specimen Hill, Breakfast Creek is on the eastern side. Both contain
alluvial cassiterite.
The geology of the locality is well described in “The Mineral Deposits of New South Wales”
by Markham & Basden (1974), downloadable from DIGS here (doesn't work 2024), reference number
R00037944. The quote following
is from page 371.
“Two or three kilometres to the west, (ie of the Paradise lodes ed.) on the summit of a high hill, is the
Specimen Hill (also known as Mt Garth or Mills) lode (GR 45493722 Grafton
1:250,000). Workings, consisting of cuts, shafts to 20m, and adits, extend for
300m. Thin, tin-bearing veins run in several directions. Some of the vein
material is very siliceous, consisting of granitoid quartz (clear, white and
brown grains) with scattered vughy inclusions containing tourmaline and minor
cassiterite and epidote. Patches rich in chlorite are also present. Drill holes
at Specimen Hill (Rasmus 1972 a,b) intersected up to fifteen thin veins, but
the cores contained no visible tin. Production is not known.”
The earliest reference I can
find to mining at this place is in 1910; despite much prospecting work nothing
substantial seems to have been discovered then or since. The reference to
Rasmus’s report on drilling in 1972 is part of ongoing prospecting from 1971 to
at least 1977. From the mineral collecting point of view, I found the comments in a report dated 16.11.77 the most interesting (image opposite). This is the last
mention of the site I can find in DIGS.
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| Candle crystals - Paul Hayes photo |
What are you likely to find at
Specimen Hill? Quartz crystals for sure, including the fascinating “candle
crystals” (which look like they have had wax poured over them); crystal groups;
possibly cassiterite crystals and probably schorl tourmaline, epidote and
chlorite – if you are lucky, several of these in the one specimen.
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| Quartz crystal group - Paul Hayes photo |
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