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New Zealand Institute.

Geological Survey. During the past year Mr. Cox has been engaged for three months, from January to March, in an examination of Cape Colville Peninsula, more especially at the mining centres of the Thames, Coromandel, Waitekauri, Owharoa, Waihi, and Te Aroha. The most important results which he has obtained, lie in his determination of the stratification of the rocks at the Thames. He has shown there that the beds of the auriferous series consist of alternations of a moderately hard, compact, pyritous, tufaceous sandstone (tufanite of Dr. Hector); with less pyritous beds; a similar rock, which is, however, much broken up into pieces by joints; and a hard green dioritic rock, which is of true fragmental origin, but which passes at places into crystalline bands which are never continuous for any great distance. It is in the first of these that the reef has proved most highly auriferous, and while gold does occur in them while passing through the second class of country, they are not as a rule payable, and where the reefs traverse the hard rocks, they are absolutely barren. He has shown that several of these hard belts occur, and that where they are met with in the lower levels of the mines, the gold is cut off by them, but that other belts of auriferous country occur below, in which reefs have been worked. His work generally tends to show that, so far from the Thames being worked out,

there are yet, in all probability, as rich auriferous belts of country at lower levels as have hitherto been worked near the surface, and that gold will be found to quite as great depths as it is practicable to work. Besides this, he has illustrated the structure and behaviour of the reefs by numerous sections, and has also prepared a plan and section of the Ohinemuri and Te Aroha Districts. During part of April he was engaged in an examination of the Blue Mountains, on the northern side of the Shag Valley, with the special object of determining the position of the Blue Mountain limestones. These he has shown are interstratified with slate and sandstone of Lower Carboniferous age, which form the first range north of the Shag River, and are separated from the Te Anau series of Upper Devonian age, which form the next range by a large fault which traverses the country in a N. 65° W. magnetic direction, and has a downthrow to the S.E. Mr. Cox has also made special reports on the Woodstock Gold Field and the Ross and Humphrey's Gully mining claims on the West Coast, and has examined the lignite deposits at Norsewood, which he reports to be of an inferior character. During the latter part of November, and part of December, Mr. McKay was engaged in collecting moa bones at Motanau and examining the country between Motanau and the Cheviot Hills. During this work the principal result arrived at, from an economic point of view, was the discovery of an outcrop of hematite about six feet wide, associated with the Triassic rocks of the coast range near Motanau. An analysis shows that this ore is specially adapted for the manufacture of hematite paint. After this he was engaged in Museum work during the month of January, and during February and the early part of March he examined the antimony deposits of the Carrick Ranges in Otago and collected fossils from the coal strata of the Bannockburn. He reports that there are three lodes which are apparently convergent, the thickest of these being two feet at its widest part; an outcrop of antimony can be traced at places on the surface from Alexandra, at the Manuherikia Junction, to the hills west of the Nevis Bluff, on Kawarau River, a distance of over twelve miles. During April and May he was engaged, at the request of the Hon. the Minister of Mines, in making a typical collection of the rocks of the Reefton District in duplicate. One of these collections was deposited at Reefton as the nucleus of a museum. While thus engaged he made a detailed examination of the relations of the various beds and confirmed the views previously held concerning them. He also gained important information concerning the extent of the coal-bearing areas, proving their probable continuance, as a basin, across the Inangahua Valley, comparatively near the surface about Reefton, but at much deeper

levels towards the junction of the Inangahua and Buller Rivers. He also made a special report on an antimony lode at Reefton, showing that an outcrop had been found which was about eighteen inches thick, and the reef had been driven on for 150 feet from that point without antimony being found. Heavy lodes of antimony are, however, found in several of the auriferous claims from Rainy Creek to Boatman's, which, in all cases containing gold, are treated in the ordinary way for the extraction of this alone, all the antimony and probably much of the gold being thus sluiced away. An examination of the auriferous cements at the head of Lankey's Gully showed that tinstone undoubtedly occurred associated with these in small quantities, but bad weather prevented any attempt being made to trace this back to its parent rock. He visited Langdon's Reef, near Greymouth, and reports that the thickness of the reef, at present being worked, is about two feet nine inches, which, being less than it was at the outcrop, shows the lode to be of a bunchy character. The outcrops of coal in Coal Creek, Greymouth, were also examined, and he reports that two seams of coal 6 feet and 10 feet in thickness respectively, occur in the lease, in which a considerable quantity can be worked level free. In the month of June Mr. McKay paid a visit to the Terawhiti reefs, and reports that the Albion claim possesses a reef of an average thickness of from 18 inches to 2 feet, which has been followed along its strike for a distance of 6 chains, and for a depth of 130 feet. Some assays of quartz from this claim have yielded over 3 ozs. of gold per ton, but the specimen brought by Mr. McKay gave nothing but traces of the precious metal. Publications. The following publications have been issued during the year: (1.) Sixteenth Annual Report of the Colonial Museum and Laboratory, together with List of Additions, etc., and an Abstract of the Results of Analyses. 64 pp. 8vo. (2.) Manual of the Birds of New Zealand, illustrated with 39 lithographs and 22 woodcuts. 106 pp. 8vo. The Fifteenth Progress Report of the Geological Survey of New Zealand for 1880–81. By Dr. Hector. With maps and sections. Including Special Reports on the Chrome Deposits of New Zealand (Hector, Cox); on the Aniseed Valley Copper Mine (Cox); on the Richmond Hill Silver Mine (Cox); on the Wallsend Colliery, Collingwood (Cox); on the North Auckland District, including Thames and Coromandel Gold Fields, Island of Kawau, and Drury Coal Field (Cox); on the Aorere and Takaka Districts, Nelson (Cox); on the Waitaki Valley, Lindis, and Wanaka Lake District (McKay); on the Coal-bearing Deposits near Shakspeare Bay, Picton (McKay); on the Caswell Sound Marble (McKay). An Index to the Localities where Fossils

have been collected in New Zealand, with their Stratigraphical Position, is in course of publication, and will shortly be followed by the Sixteenth Progress Report. The Handbook of New Zealand, prepared by Dr. Hector for the Melbourne Exhibition, is now out of print, and a third edition is in preparation. Progress is being made with the preparation of several important works bearing on the Natural History, Mineralogy and Geology of the colony. Libraries. The libraries in connection with the Museum have increased rapidly during the past year, and it was thought necessary that a librarian should be appointed. Mr. T. W. Kirk has been placed in charge of the Patent and Public Libraries, the work being performed out of official hours. New Zealand Institute Library.—The additions to this library comprise about 255 volumes received in exchange for the Transactions from the various societies and institutions whose names appear in List III. Patent Library.—This collection remains as hitherto in the lectureroom, and appears to be greatly appreciated, especially by those engaged in mechanical pursuits. Thirty-two volumes have been added during the year. Public Library.—It was stated in last report that very many of the works belonging to this library were missing when it was removed to the Museum. Private inquiry by the librarian resulted in the recovery of sixteen volumes, and it has now been decided to advertize in the local newspapers and the Government Gazette requesting persons having in their possession books belonging to this Library, to return the same to the Museum as soon as possible; it is hoped that by this means a large proportion of the missing works may be recovered. Meteorology. Meteorological statistics are collected at four second-class stations in New Zealand, at Auckland, Wellington, Christchurch, and Dunedin; and observations of rainfall, temperature and wind-direction are received from thirty third-class stations. The results are published monthly, and will be collected as usual into a biennial report. There is no first-class meteorological station in New Zealand having the equipment required by the Intercolonial Conference. The system of intercolonial telegraphic weather exchange has now been in operation for twelve months, and the results obtained and the proposals for securing earlier publication, in an easily comprehensible form, of the weather changes, will form the subject of a special report.

The New Zealand weather for each day is now published the same afternoon in Sydney, Melbourne and Adelaide; and there is no reason why, with a few changes in the organization of the system, the Australian weather phase for each day should not be published in all the principal towns in New Zealand on the following morning. By this means from twenty-four to sixty hours' notice would be given of all the most important weather changes. Observatory. The time-ball service for Wellington is at present suspended, as the ball was dismounted when the old Custom House was removed. Arrangements are being made, however, for its re-erection in a prominent position. In the meantime the Telegraph Department continues to be supplied with mean time, and time signals are furnished to Lyttelton and to various private persons by galvanometers. In reply to an application from the Home Government, arrangements are being made for organizing a corps of local observers for the forthcoming Transit of Venus in December, to assist the party of observers that are to be sent out from Greenwich Observatory. Laboratory. The number of analyses performed in the Colonial Laboratory for ordinary purposes during the past year is 265, and the Laboratory number now arrived at is 3,285. These analyses are subdivided as follows:—Coals, 13; minerals and rocks, 58; metals and ores, 40; examinations for silver and gold, 89; waters, 21; miscellaneous, 40. Total 265. Besides the above, a large number of examinations have been made under the Adulteration Act of 1880, by the Analyst; and about the month of August time was occupied in visiting the Rotorua District, at which place he collected samples and analyzed specimens of water from the various springs. The Analyst has also been occupied at various times in verifying certain sets of weights and measures, in compliance with the Act. The results of the analyses, which are of general interest, are noted in full in the Annual Report on the Museum and Laboratory. James Hector.

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https://paperspast.natlib.govt.nz/periodicals/TPRSNZ1882-15.2.6.1

Bibliographic details

Transactions and Proceedings of the Royal Society of New Zealand, Volume 15, 1882, Unnumbered Page

Word Count
1,923

New Zealand Institute. Transactions and Proceedings of the Royal Society of New Zealand, Volume 15, 1882, Unnumbered Page

New Zealand Institute. Transactions and Proceedings of the Royal Society of New Zealand, Volume 15, 1882, Unnumbered Page