In Australia, precious opal is found in Cretaceous age sandstones and mudstones. These sedimentary rocks were deeply weathered and this weathering released silica into the groundwater.Australia is the only part of the world where opalised animal and plant fossils have been found. Opal artefacts several thousands of years old have been discovered in East Africa. As early as 250 BC the Romans prized opals, thought to have come from mines in Eastern Europe, the ancient world's main source of opals. There are many aboriginal dreamtime stories that feature opal. Australian opals discovered during the late 1800's found little favour with European markets but their commercial value increased in the 1900's and in 1932 Australia took over as the major producer of opals in the world and remains the largest producer to this day. Opal is found around the world (Brazil, Mexico, Honduras and the western US) however Australia produces 95% of the world's precious opal and it is our official national gemstone. Opal was first mined commercially at Listowel Downs in Queensland in 1875 and later at White Cliffs in NSW. Today, Coober Pedy (SA) is the main producer of white opal, though in recent years this field has expanded and all types of opals are found. Other centres in SA include Andamooka and Mintabe. Lightning Ridge (NSW) is renowned for black opal and formerly White Cliffs was a large producer of high quality opal. Boulder opals (opals in concretionary ironstone) are mined in Queensland from numerous localities in a zone extending from the Eulo and Cunnamulla district in the south and northwest for a distance of over 700 km to Kynuna in the north. The towns of Quilpie, Yowah and Winton are the main opal mining and wholesale centres. Opals are considered gemstones and have been used in jewellery for thousands of years.Throughout much of history, opals were actually believed to be good luck. The Romans thought that opals were one of the luckiest gemstones and a symbol of hope. In the Middle Ages, opals were believed to be bestowed with all the positive properties of coloured gemstones due to its rainbow-like play of colour. Finally, there is a superstition that you should not wear an opal unless it is your birthstone otherwise misfortune will befall you. This, of course, is far-fetched, but the notion could have been promoted in the late 19th and early 20th Centuries by diamond traders who were trying to increase sales of diamonds and deter people from buying opals. Possibly related to this is the thought that you should set opal jewellery with diamonds as their powers of good fortune will override any negativity held by the opal. The great majority of opal does not show play of colour and is called common opal or potch however this is not the case with a precious opal. Opal is a precious gemstone, like rubies, emeralds or diamonds. Opal is rare, and it is expensive to prospect and mine for.Silica is one of the most common minerals on the planet, but precious opal is very rare – far more rare than diamonds. Precious opal is rare because the natural processes that create it rarely occur.Most (at least 95%) of the opal found by miners is common opal without gem colour. In Australia we call it potch. It can be white, grey, black or amber coloured. Even when a miner finds gem-coloured opal, most of it can’t be cut into gemstones because it’s too thin, or sandy. This specimen is part of a larger collection of geological and mineral specimens collected from around Australia (and some parts of the world) and donated to the Burke Museum between 1868-1880. A large percentage of these specimens were collected in Victoria as part of the Geological Survey of Victoria that begun in 1852 (in response to the Gold Rush) to study and map the geology of Victoria. Collecting geological specimens was an important part of mapping and understanding the scientific makeup of the earth. Many of these specimens were sent to research and collecting organisations across Australia, including the Burke Museum, to educate and encourage further study.It is not known where this opal originated, except that it is probably from Victoria, as it has been recorded from many localities in the State. Common Opal is formed from silica-rich water circulating through rocks near the Earth’s surface. It consists of minute spheres of silica arranged in different ways. In common opal, the spheres are of different sizes and randomly arranged, unlike in precious opal where the spheres are of similar size and uniformly arranged in three dimensions. These differences account for common opal generally being translucent to opaque and without the play of colours, or opalescence, displayed by precious opal. Common opal is found in many localities and different geological environments throughout Australia and the world. Precious opal requires special conditions to form and is much less common. Australia produces most to the world’s precious opal. burke museum, beechworth, indigo shire, beechworth museum, geological, geological specimen, precious opal, opal, brazil, mexico, honduras, queensland, coober pedy, gemstones, jewellery, play-of-colour, light blue

The tent model mentioned in the letters was displayed in the Ballarat School of Mines Museum. During the 1960s it was transferred to the Ballarat Historical Society. Two handwritten letters on paper with black mourning edge written by Walter M. Hitchcock to the Ballarat School of Mines, and another written by Walter's brother George M. Hitchcock.Letter transcription follow: Letter from Walter M. Hitchcock regarding the death of James Oddie and early gold mining at Ballarat, 1910 and 1911 48 The Memorial Hall Farringdon St London Dec1/10 The Secretary Ballarat Museum Dear Sir, I am just now sending you this line, i anticipation of further correspondence later on, simply to forward you a Post Card of the 1st mining tent erected 1851 on the site of he then newly proclaimed Township of Ballarat, which, as the sole survivor of the party who built the original, I have had the pleasure in making, and have decided to present it to your museum, Sir Jno Lasenor out Agent General for Victoria came to a Bazaar recently held in London. where I had it on view in the museum from 3 days, - and desired I would allow its [ ? ] exhibited in the first large window of the beautiful new building of the Victoria Agency situate in the Strand. It is there for the past few days and he may wish it to remain a week or two longer, I know of no other exhibition of it to delay it being packed and shipped to my relatives in Geelong (Mr [?] Bright of Hitchock's Firm) who may wish to show it in one of their windows before forwarding it to your museum - I have had an itemised pane glass case made for it with drop down end and [?} it stands on a plateau of moss, to represent grass 32 x 13 x 13 high and chimney 14 1/2 - the case is made 34 x 26 x 20 high inside - I shall have it very carefully packed - tent emptied tools, beds, &c &c in separate packing and insured for 50 pounds - I will send you full details later on. I hope and believe your President will accept it in due time Meantime believe me to be very truly Cat Walter Hitchcock G.F.B. 48 The Memorial Hall Farringdon St London March 15th 1911 The Secretary Ballarat School of Mines Dear Sir, Thanks for your letter received last week – I have unaccountably mislaid it, so cannot address you personally, shall no doubt find it among office papers. The model is being fetched today from Victorian Agent General’s (Sir John [Lavernor?] office window in the Strand where many thousands, he tells me, have stopped in passing to see it (their first peep of Ballaarat). It will be on view at Blackheath (Kent) for a week, then packed and shipped without further delay. I shall enclose in the glass case (which is 26 x 34 x 16 in high) some spare minced moss and gas (smoke) in case in transit the plateau suffers by shaking (though it is well glued down). All the tools, mining appliances, cradle, windlass, &c will be separately packed enclosed – which you can easily place in respective positions. HRH Prince of Wales has graciously accepted a photo of it – and in my letter to him when sending it for his acceptance I said – as he would probably ere long visit Australia as did his grandfather and father, which ought to (and certainly will) include at least a day or two in seeing your beautiful City, and also something of your mines &c instead of the hurried visit of his father (2 hours) when he, as Duke of York, unveiled a statue to the memory of those slain in the sad Boer War, which now is admitted by almost everybody to have been a big political mistake, - though in the future with England’s present wise policy towards that country it will prove for Africa’s welfare. It may interest you to know that when I ascertained that Geelong was not to be visited by the Royal Pair – I went up to St James’s Palace by appointed time the Duke’s private Secy Sir Arthur Bigge – taking with me a specially illustrated paper issued in Melb. showing many pictures of the beauties and industries of Geelong – Sir Arthur was impressed but said all the arrangements for the Royal stay in Victoria (10 days) were made locally, by Lord Hopetoun and collegues and committee, and were practically closed – which meant that only a brief trip to Ballarat to uncover the memorial was intended outside Melbourne. Perhaps if we were Melbourne residents we should have succumbed to the prevailing spirit of selfishness – forgetting (or trying to forget) that there are many beauty spots in Victoria and centres of great interest - Ballarat, Geelong, Bendigo, &c that ought to have been visited instead of Melbourne only. Finding Sir Arthur favorably impressed about Geelong I thanked him and returned to City work again. I at once called to Geelong whose mayor and friends had been twice unsuccessful in trying for the Melbourne functions programme being altered to include a visit to Geelong and lovely spots in the Western District, reporting my interview with Sir A B and his favourable reception of my representations, but that any alteration to the programme of engagements during the Royal visit must be made locally and by the local authorities. This had the desired success for on receipt of my message the Geelong mayor and colleagues again reopened the question and went to Melbourne, resulting in a concession (but what an altogether inadequate one) and they graciously ? consented to the train, on its way with the Duke and Duchess to your city, to stop at the Geelong stn (15 minutes) and so it came about that by a hasty local effort, 3,000 school children, and not a few of the leading people including the Mayor &c were gathered to welcome them in Geelong. The National anthem being sung, an Address read and presented and kindly replied to. Now Ballarat should doubtless has influence. See to it when our P. Of Wales visits Victoria – an unselfish ¬ programme is fixed up – and HRH afforded ample opportunity of visiting leisurely your city, Geelong, Bendigo and other centres of beauty and importance. The Prince himself will be the gainer by such an equitable and enlightened programme, - and come back with all the more favourable views of the marvellous development ever since our family first settled in Geelong in 1850. A far preferable result of such a visit than night after night having Melbourne Banquets and the visiting of its undoubted attractions - whilst all the rest of the State remained unvisited. Such an official mistake must not be made again. I will write you again, stating name of steamer of which the model is shipped and date of departure – it is firmly built on a backing of 3/8 in oak tall uprights so through the 7/8 in plateau and am entrusting the packing be very careful. I expressed firm – so that except possibly any breakage in glass case – it should reach you in due time all right. The top of case will be screwed so that it can be readily removed temporarily to enable my [ ? ] firm to show it in one of their windows. Believe me Yours very truly Captn Walter M. Hitchcock My brother will deliver it on my a/c – all carriage paid. Mt very kind regards to my friend since 1850 Jas Oddie. University of Ballarat Historical Collection Cat. No. 8133.3 & .4 Letter from Walter M. Hitchcock regarding the death of James Oddie and early gold mining at Ballarat, 1911 48 The Memorial Hall Farringdon St London April 20th 1911 My Dear Sir, It is with no ordinary feeling of regret that I received the tidings of the death of my good friend, your fellow citizen for many years, Mr James Oddie. Living at Geelong from March 1850 I came to know him there as carrying on a foundry business in Ashby. With the discovery of gold at Ballarat started off almost of the working people, as well as of all other classes of the male population. Mr Oddie arrived in Ballarat I believe on or about September 1st 1851. My three comrades and I arrived October 1st 1851 – among the many thousands soon gathered within a mile or so of Golden Point – my friend Oddie and I often met. I returning to Geelong after a year mining – my friend on the other hand remaining at Ballarat ever since – a marvellous record, and I am sure his life has been one of unique value to your City in many ways, - his age (87) naturally prepared me for his call home – and only two mails before the news came I received from him on of his kindly chatty letters in which amongst other things – he referred with pleasure to having received from me two 10 x 12 photos – one being of my model and that he was arranging to have it placed in a shop window in your city. I am interested in the fact of your having known each of my three comrades of 1851/52. It was J.M. Garrett and I who got permission to conduct public Sunday morning service in their large Marquee – used all the week for issue of Licenses in the absence of any church buildings, and it being on wet Sundays impossible to have services as usual under the trees – Ballarat then was more like a Gentleman’s Park – than bush country – but the axe soon did its work – and all were felled for our cooking, and hencewith to make our kindling etc. Shafting of holes not being at first done because too shallow – our deepest (at Eureka) was only 115 ft. Bendigo I hear had now mines of 4,000 ft in depth (deeper than our tin or coal mines here). I fortunately have, in excellent state of preservation, my last of 12 licenses dated October 1 1852 and have recently purchased here a Miner’s Right dated 1864, to that when explaining on matters re Gold Licensing I can show sample of each. With kind regards Believe me Yours sincerely Walter M. Hitchcock Geelong June 20/11 Dear Sir, By rail to day through Messrs Bannister I send the model of miner’s tent packed in a case 50 donated by my brother Captain Walter M. Hitchcock of London. This model was made by my brother and represents the tent he worked in on the Ballarat Gold Fields in the year 1851 or 2. In a separate parcel a few extras omitted from the case. Please send me receipts in duplicate, one for my brother, the other for the Customs, Geelong, as being donated to your institution, after some little correspondence it was admitted [??] any payment for duty. You probably have my brother’s address and would like to acknowledge its arrival, direct. I hope it is in good order. I did not open it for show in Geelong, as there would be less risk of breakage on repacking. With kind remembrances. I am Yours Faithfully Geo. M. Hitchcock. A Mr G. F. B. Sharick who is living near my home called in to see my model – he said he knew FM [Fred Martell] and was lately at Ballaratballarat school of mines, frederick martell, fred martell, james oddie, walter m hitchcock, walter hitchcock, f m garratt, george hitchcock, hitchcock, golden point, gold discovery, j m garrett, gold license, j.m. garrett, t.m. hall, george m. hitchcock, f.m. garratt, walter m. hitchcock

"Mr. J. B. Rankine, the inspector for the Dundas goldfield, entered upon his duties on June 4, 1897. He states that his preliminary examination of the mines in active operation on the field, which was of a hurried nature, revealed in several instances a very unsystematic method of mining, which must have been attended with grave risk to the workmen had it been allowed to continue. The underground workings in one, particular mine which he inspected, and wherein a large number of men were employed, were of such a serious and dangerous nature that immediate steps and measures had to be taken to secure the ground for the safety of the men so employed. Without entering on this occasion into the question of culpability, he desired to place on record that the manager had shown a readiness and willingness to carry out his (the Inspector's) instructions. (West Australian, 21 February 1898)Handwritten letter on folded, lined paper. The letter was written in Norseman and relates to school fees for the Ballarat School of Mines. Norseman Oct 17 98 F.Mmaretll esq Registrar Ballarat School of Mines Sir Yours of the 1st instant to hand and I have much pleasure in forwarding you a cheque for L8.8.0 the account of school fees. Your remarks re telling the Minister are really too funny to be taken seriously. the remind one of kids at School "If you don't give me my marbles ill tell your father" however you have been very patient in the matter + I don;t grumble. Hope school is doing well + maintaining its good name, My kind regards to proff Smith + other enquiring friends Yours very truly J.B. Rankinej.b. rankine, dundas goldfield

Black and white postcard photograph of the upper structures of a gold mine and surrounding buildings.Printed in red at top of photo: "Greetings From Chiltern" Written on back of card: "c/o Mrs A. Smith. Melbourne Rd. Chiltern | Just a line to let you know I arrived safely and am having a good time. I went to a picnic on Easter Monday and had a great time. Did you go to the sports were they a success. We have plenty of music here Aggie plays the piano and I brought my violin up and a boy staying here from Melbourne sings. Hoping to hear from you soon. Your loving friend etc."chiltern, gold mining, mining industry, chiltern mine

Postcard: black and white postcard, top section has written ' Greetings from Bendigo' Lower section shows image looking northwards up Pall Mall. Poppet head on RH side, mine chimney and Post Office middle image. Tram lines and poles up centre of Mall. On rear of card in black pen: 17.3.07, Dear Auntie, I hope you are quite well. We are going to Melbourne on Wednesday and going on to Bairnsdale on Saturday. We are having a good time here. Reg send his love, With love from Merle. Addressed to Miss E. Dahlsen, (Lake Tyers House, Lake Tyers - crossed out) Bairnsdale. Postmark is Bendigo 10.45 a.m. 17.4.07, 1d. Stamp attached.bendigo, streetscape, pall mall, bendigo, bairnsdale, dahlsen, merle ( bush ?)