167 
The porphyry-felsite series is well developed around Buchan, and 
passes up by passage beds of varying thickness at the Murrendal Biver 
into Middle Devonian limestones. 
To the west of Mackinson’s, South Buchan, and W. Tree, Mt. Mur¬ 
rendal, the porphyry-tuff series contains . the remains of plants; no 
detailed work has been done on these, but they are considered to be 
Lower Devonian. 
Presumably there is a physical unconformity between the sandstones, 
&;c., at Boggy Creek and the porphyry-felsite series higher up the creek. > 
There was no evidence of the porphyry-felsite being folded with the 
sedimentary series. 
The white mica and quartz veins usually present in the Ordovician 
are generally absent from the quartz porphyry series. 
Some deposits of iron ore, limestone, barytes, and other minerals 
have been noted, with remarks on their origin and occurrence. 
[5.3.13.] 
EECEBT Mmma m ckoathstgoloe-g. 
By H. Herman, M.M.E., &c., Director of Geological Survey. 
Immediately prior to and during Easter I inspected some of the 
more recent developments in mining 
visited the Hard-to-Seek gold¬ 
field, situated about 3 miles east- 
south-easterly from the Wingan 
River crossing of the Orbost 
to Genoa main road. Here two 
quartz reefs (Brown’s and Duffy’s), 
in granite, have been prospected 
since the beginning of the year. 
The workings are on a ridge 
rising in one part to a height 
of about 1,200 ft. above sea 
level. Brown’s reef (James 
Brown) is quartz, with hematite, 
strikes N. 75° E., dips 80° to 
the northward, and has been 
sunk on nearly 20 ft. deep. The 
lode is G in. to 9 in. thick near 
the surface, and about 12 in. in 
the bottom, for the full 8 ft. 
length of the shaft; numerous red 
and brown clay veins cut through 
it. The walls are decomposed 
coarse-grained granite. Three tons 
of picked stuff carted to and 
crushed at Yambulla, New South 
! Wales, about 40 miles distant, 
I returned, Mr. Brown informed 
; me, about 11 oz. of gold ; the 
I return showing the quality of the 
I gold had not been obtained. 
east of the Bemm River. I first 
Fig. 57. —Sections o! 
Shafts, Duffy’s Reef. 
(Scale—20 feet to 1 inch.) 
7492.-3 
