366 The N.Z. Journal of Science and Technology. [Nov. 
“ The price of calcined dolomite f.o.b. Sydney would be from £3 10s. 
to £4 per ton.’’ 
Queensland. 
In the Queensland Government Mining Journal, November, 1916, 
pp. 529-33, Mr. B. Dunstan, Chief Government Geologist, has an article 
entitled “ Magnesite, Dolomite, and Magnesian Salts.” From this article 
the following paragraphs are quoted :—- 
“ Magnesite, the carbonate of magnesia, is known to occur in many 
parts of the State, and records have been published which indicate that 
some of these deposits might be of high potential value. Numerous out¬ 
crops have been observed at Mount Davidson, Forest Gate, Cooby Creek, 
and other places in the Toowoomba district, but the small quantities 
observed do not offer much encouragement for prospecting operations. 
Outcrops of the mineral have also been observed at Limestone Hill, Bed- 
bank, and Silkstone, all within the area of the Ipswich Coalfield. About 
Kilkivan and Degilbo in the Burnett district, and at Mount Wheeler, 
Ironpot Mountain, The Pointers, The Oaks, Mount Fairview, and Canoona 
in the Bockhampton district, other deposits are known, most of which 
show magnesite outcrops of fine quality, but apparently of very small 
extent. 
“ The deposits about Marlborough, however, and Kunwarara, between 
Bockhampton and St. Lawrence, have been examined recently, and large 
quantities have been observed to occur over a considerable area of country. 
Close to St. Lawrence an extensive bedded deposit of magnesite is said to 
occur as a Becent geological formation, but no details are available con¬ 
cerning it. At Mount Pring, twelve miles from the port of Bowen, an 
examination has shown that remarkably pure lodes of magnesite are exposed 
on the sides of the ridges, and not very far from railway communication. 
“ Dolomite is to be found in numerous localities in the State, the most 
important deposit being at Flinders, about, two miles from the Ipswich- 
Fassifern Bailway-line. At Silkstone it has also been found as a bedded 
deposit 50 ft. thick in a coal-bore. 
“For general references to published records of occurrences of 
magnesium-bearing minerals the Queensland Mineral Index will be found 
a useful guide. 
“ Magnesite exists in three types of formations— i.e., lodes, bedded 
deposits, and irregular masses—the first being a direct accumulation from 
mineral solutions in fissures in serpentine or serpentinous schists, and a 
result of the alteration of the serpentine. The second is caused by the 
replacement of limestone in sedimentary formations by the magnesia in 
mineral solutions ; the third one being a product of the surface decom¬ 
position of olivine-bearing basalts and other volcanic rocks. 
“ An official inspection about Marlborough has shown that hundreds 
of tons of the mineral at Princhester Creek are exposed on the surface, 
while in several other localities in the same district areas are to be observed 
covered by loose magnesite boulders, and by outcrops of which no estimate 
of quantity can be made without excavations being made. 
“ The average sample (6) from Kunwarara, given in Table A, was taken 
from a large body of stone about two miles and a half southerly from the 
railway-station of that name. Outcrops occur in innumerable places in the 
neighbourhood, which have been only casually inspected, but sufficiently to 
show that very large lodes would probably be defined by a little further 
prospecting. 
