1918.] The N.Z. Journal of Science and Technology. 
365 
“ Dolomite . 
“ Though dolomite has been recorded from many localities in New 
South Wales, the workable deposits are few. The following are amongst 
the most important of the occurrences :— 
“ 1. Cudgegong .—Situated about fourteen miles by road from Rylstone 
Railway-station, 157 miles from Sydney. A number of dolomite deposits 
occur in the neighbourhood of Cudgegong, associated with limestones, sand¬ 
stones, shales, and tuffs. The largest outcrop lies about two miles and a 
half east-north-east of the township, and is approximately 80 chains long, 
with an average width of 15 chains. Practically inexhaustible supplies of 
dolomite are available hereabouts, but owing to its distance from the rail¬ 
way it will be a long time before these deposits can be profitably exploited. 
“2. Havilah .—About eight miles east of Mudgee, within a few chains of 
the railway-line, 177 miles from Sydney. Beds of dolomite up to 2 chains in 
width occur, intercalated with steeply inclined, high-grade limestone, and are at 
present being quarried for Messrs. G. and C. Hoskins’s ironworks (at Lithgow). 
“ 3. Boogledie. —(a.) About two miles north-west of previous occurrences, 
and probably a continuation of the same beds. The dolomite occurs as 
narrow lenticular beds associated with high-grade limestone. The outcrop 
is traceable a distance of 85 chains. 
“ (b.) About a quarter of a mile east of the previously described deposit 
is another belt of high-grade dolomite, exposed for a distance of 25 chains, 
with a width of from 2 to 3 chains. Now being worked for the Broken 
Hill Proprietary Steelworks. 
“ 4. Cow Flat .—Portion 73, Parish Ponsonby, County of Bathurst. 
About four miles south of George’s Plains Railway-station, 152 miles from 
Sydney. The outcrop is more or less concealed by talus and surface soil, 
so that it is impossible to estimate its probable extent. Less than 2 chains 
square has been exposed by quarry and trenching. 
“ 5. Brogan’s Creek .—Portion 142, Parish Clandulla. Situated within 
a few chains of the Mudgee Railway-line,, 141 miles from Sydney. An 
extensive deposit of limestone occurs here which on analysis shows a high 
percentage of magnesium carbonate. Probably careful search would prove 
the presence of well-defined intercalated dolomitic beds. 
“6. Mount Fairy .—Portion 167, Parish Fairy Meadow, situated within 
two miles of Mount Fairy Railway-station, 168 miles from Sydney. An 
extensive deposit of magnesian limestone with beds of high-grade dolomite. 
Practically unlimited quantities available. 
“7. Ilford .—Situated about two miles north-north-west of Ilford, seven 
miles from Clandulla Railway-station, 148 miles from Sydney. Bands of 
dolomite up to 1 chain in width occur intercalated with a high-grade lime¬ 
stone. A large quantity of dolomite is available. Analyses of the material 
from each of the above localities follow :— 
Locality. 
CaCO 
MgCOg. 
MnCOg. 
Fe20 3 
and 
A1 2 0 3 . 
Gangue. 
FeC0 3 . 
Organic 
and 
Undeter¬ 
mined. 
Total. 
(1) Cudgegong 
53-78 
39-34 
0-50 
2-86 
3-22 
0-30 
100-00 
(2) Havilah 
58-41 
38-93 
0-11 
1-96 
0-78 
Trace 
100-19 
(3a) Boogledie 
58-90 
38-80 
0-29 
0-64 
0-46 
1-30 
100-39 
(36) Boogledie 
50-89 
39-89 
0-53 
0-86 
5-28 
2-90 
100-35 
(4) Cow Flat 
59-64 
37-58 
0-50 
0-38 
1-66 
. - 0 
99-76 
(5) Brogan’s Creek.. 
82-39 
16-30 
0-02 
0-24 
1-10 
. 
100-05 
(6) Mount Fairy 
58-70 
39-07 
0-02 
0-44 
1-72 
« s 
99-95 
(7) Ilford .. 
53-50 
32-88 
0-30 
1-66 
9-20 
1-45 
1-01 
100-00 
