THE MINERALS OF NEW SOUTH WALES. 185 



Iii weight it is 7*352 grains (troy), and at 70° F. the sp. gr. is 

 3-56. 



Mr. Wilkinson mentions, that from the Bengonover Tin Mine, 

 near the Borah Tin Mine, several diamonds were obtained, the 

 largest being 7*5 grains. From the Borah Tin Mine, situated at 

 the junction of Cope's Creek with the Gwydir, 200 were obtained 

 in a few months ; out of a batch of 86, averaging 1 carat grain 

 each, the largest weighed 5 - 5 grains. Diamonds have been found 

 on most of the alluvial tin workings at Cope's, Newstead, Veget- 

 able, and Middle Creeks, and elsewhere in the district. 



Amongst other places the diamond has been found in the Turon, 

 the Abercrombie, the Cudgegong, Macquarie, and Shoalhaven 

 Rivers. One was found in August, 1874, in Brook's Creek, Gun- 

 daroo, near Goulburn, valued at £3. At Uralla, Oberon, and 

 Trunkey, they are by no means uncommon ; and I have recently 

 obtained a small hemitrope octohedron from the Lachlan River 

 weighing 1*5 grains. 



Diamonds have also been obtained from diggings on the sea- 

 shore near to Ballina. 



A drift having almost exactly the same characters as those at 

 Bingera and Mudgee, occurs at Wallerawang, and on the Mary 

 River, Queensland — even to the presence of masses of conglomerate 

 of jasper, quartz, and other pebbles agglutinated together by a 

 feiTuginous and manganiferous cement. 



Graphite. — Plumbago. 



Chem. comp. : Carbon. Hexagonal system. Occurs with quartz, 

 iron pyrites, and pyromorphite at the head of the Abercrombie 

 River, possesses a curved lamellar structure. Occurs in small 

 radiating masses in the granite at Dundee, in New Valley, and near 

 Tenterfield. 



Reported also from Bungonia, but its existence there is doubtful ; 

 also from the Cordeaux River, near Mt. Keira, and Plumbago 

 Creek near junction of Timbarra Creek, county of Drake. 



Small particles are not uncommon in the sandstone about Sydney 

 and other parts. 



Any black clay or other substance which can be made to leave a 

 mark on paper is brought into Sydney as a sample of a most 

 valuable deposit of graphite. I have not yet seen, out of many 

 highly extolled specimens, one fit for even the commonest purpose. 



Coal. 



As a mineral there is not much to be said about the coal of New 

 South Wales, as there is no very material difference between it 

 and that of England. The coal from certain mines is caking, 

 and from others non-caking, i.e., it will not furnish a coke. The 







