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ãã®ç£å°ã®æŽå²ç䟡å€ã¯é åãããã«é«ããŸããÐhezkazganã¯ãœããšãæä»£ã«Kanysh Satpayevã®æ¢æ»æŽ»åã«ãã£ãŠç§åŠçã«è©äŸ¡ãããäž»èŠãªé±æ¥ã»è£œé¬çºå±ã®åºç€ãšãªããã«ã¶ãã¹ã¿ã³ã®é ç£æ¥ã®ã¢ã€ãã³ãã£ãã£ãšçµã³ã€ãããŸãŸã§ãããããé±ç©åéå®¶ã«ãšã£ãŠããã®å°åºã®æã芪å¯ãªéºç£ã¯ãç¹å®ã®äºæžãšéã§æšæ¬ãåéã«å ¥ã£ãåè¶ããç¡«åç©ã®suiteã§ãïŒæ¹è§£ç³ã chalcocite-djurleite çŸ€æšæ¬ãbetekhtiniteãéäºéé±ãèç³ãèªç¶éãèªç¶é ãããã³éæ¶ç³ã®çµã¿åããã§ãã## Featured Specimens
Search for specimens: View all bornite specimens from Dzhezkazgan mining district, Kazakhstan
Dzhezkazgan is best understood as a mining district rather than a single specimen pocket or single mine. Specimen labels may read Dzhezkazgan, Zhezkazgan, Dzezkazgan, Jezkazgan, Karaganda Region, Karagandy Province, or older Soviet-style locality names. Mindat notes that the district has been wrongly reported in some sources as a single mine, and that notable mineral specimens came from several shafts, including #31, #46, #55, and #57. For collectors, those shaft numbers are not decorative trivia: they help separate serious old labels from vague commercial ones.
The deposit belongs to the sandstone-hosted copper family. The main ore-bearing section consists of multiple copper-bearing sandstone members within a Pennsylvanian fluvial red-bed sequence. The ore minerals occur in sandstone and conglomerate as replacements and cement between grains, rather than as a simple vein system. U.S. Geological Survey work describes ten ore-bearing sandstone members and ore bodies distributed across a broad district-scale area. The system is tied to reduction zones in red beds, former petroleum accumulations, evaporitic brines, and structural controls along anticlines and cross-folds. Re-Os dating of copper sulfides places Dzhezkazgan mineralization around the Pennsylvanian-Permian boundary, roughly 299â309 Ma.
The district is enormous by specimen-locality standards. USGS summaries give Dzhezkazgan a copper metal content on the order of 22 million metric tons, with average grades in the associated sandstone copper deposits of about 0.85â1.7% Cu and important silver and rhenium values. Modern studies of Zhezkazgan sediment-hosted stratiform copper ores list bornite among the primary ore minerals together with chalcocite-group copper sulfides, chalcopyrite, galena, and sphalerite.
Mining history reaches far deeper than the Soviet industrial story. Archaeological and geological sources describe Bronze Age copper mining and metallurgy in the broader Zhezkazgan-Ulytau and central Kazakhstan region, with ancient miners exploiting oxidized copper ores and using stone tools, fire-setting, and ore-processing settlements. In modern industrial history, Kanysh Satpayevâs work in the late 1920s and early 1930s transformed Zhezkazgan from a promising copper field into a proven giant. By the end of 1931, Satpayevâs team had demonstrated copper reserves far beyond earlier estimates, and by 1937 Zhezkazgan was being described as one of the worldâs great copper deposits.å ¬çãªç£æ¥å¹Žè¡šã¯æšæ¬ã®ç±æ¥ã«ãšã£ãŠãåæ§ã«éèŠã§ããå€§èŠæš¡ãªæ¡æäœæ¥ã¯20äžçŽåé ã«éå§ããããã§ãã«ã¶ã¬ã³ã®é±ç³ããåããŠã®ç²é ã1928幎ã«çç£ãããŸããã1938幎ã®ãœé£èšç»ã§ã¯ãé±å±±ãæ¿çž®æœèšãæ°ããéœåžãç²Ÿé¬æãåããæ°ãããã§ãã«ã¶ã¬ã³ã»ã³ã³ããã建èšããããšãæ±ããããŸããã Dzhezkazgan 鱿¥ã»å¶éã³ã³ããã¯1958幎ã«å ¬åŒã«æ¿èªãããŸããã åãã§ãã«ã¶ã¬ã³é±å±±ã¯1960幎ã«ãæ±ãã§ãã«ã¶ã¬ã³é±å±±#55ã¯1964幎ã«ãåãã§ãã«ã¶ã¬ã³ã¯1965幎ã«ãæ±ãã§ãã«ã¶ã¬ã³é±å±±#57ã¯1967幎ã«çšŒåããŸããã ãã§ãã«ã¶ã¬ã³é ç²Ÿé¬æã§æåã®é°æ¥µé ã¯1971幎2æ23æ¥ã«çºè¡ãããŸããã
æ¡éã¢ã¯ã»ã¹ã¯ãã«ãžã¥ã¢ã«ãªé倿¡éã§ã¯ãªããç£æ¥é±å±±ã¢ã¯ã»ã¹ãšããŠæ±ãããã¹ãã§ãã Dzhezkazgan ã¯æŽ»çºã§æŽå²çã«è€éãªæ¡æå°åã§ãããåžå Žã§æµéãã坿¡æ§ã®ããŒã³ãã€ãæšæ¬ã¯å§åçã«æ¡æè ãæ§åšåº«ãã³ã¬ã¯ã·ã§ã³ããã£ãŒã©ãŒç¶²ãéããŠå ¥æããããã®ã§ãããå ¬éã®ã¬ã¯ãªãšãŒã·ã§ã³æ¡éãã comes ããããšã¯å€ããããŸãããè¯è³ªãªçµæ¶ã¯å€ãã®å Žåãæ§æããšã¹ããŒãåããŸãã¯å€§èŠæš¡ã³ã¬ã¯ã·ã§ã³ããåæµéããæšæ¬ãšããŠåºäŒãããŸããã©ãã«ã«ç¹å®ã®é±äºïŒäºæžïŒãã¬ãã«ã瀺ãããŠããå Žåããã®æ å ±ã¯ä¿å䟡å€ããããŸãã## ããžã§ãºã«ãºã¬ã³é±åºïŒã«ã¶ãã¹ã¿ã³ïŒç£ Bornite ã®ç¹åŸŽ
diagnostic Dzhezkazgan bornite habit is pseudo-isometric: cubes, octahedral-looking crystals, dodecahedral forms, and trapezohedral crystals, generally reaching from small thumbnail crystals to a few centimeters. A 9 mm pseudo-octahedral bornite on baryte is a classic miniature-scale example; dealer records also document sharp crystals reaching about 2.3 cm on contrasting matrix, as well as small-cabinet pieces with numerous 1 cm crystals scattered over quartz-coated matrix. A strong miniature may have just two or three superb crystals; a cabinet example may show many smaller crystals distributed across quartz, calcite, or baryte.
Color ranges from dark blue-black to black, commonly with iridescent overtones. The best Dzhezkazgan pieces are not necessarily the most rainbow-colored. Many top specimens have a restrained metallic patinaâblue-black, silver-blue, violet, or bronzyârather than the garish acid-bright colors often associated with low-grade âpeacock oreâ sold to beginners. On fresh or protected surfaces, bornite may be more bronze-brown, but collector specimens are usually judged by the quality of the natural tarnished surface and the crispness of the underlying crystal.
Matrix associations are one of the localityâs strengths. Bornite may sit on quartz crystals, calcite, or baryte; some specimens include chalcocite-group minerals, chalcopyrite, pyrite, or sphalerite. Dzhezkazgan baryte is itself collectible, often as pale to orange blades, and it makes an especially good contrast for dark bornite. Calcite matrix pieces can be very attractive when the bornite crystals are isolated and architectural rather than crowded into a massive sulfide patch.
A distinctive point for advanced collectors is borniteâs relationship to other Dzhezkazgan sulfides. Betekhtinite from the district is famous in its own right, and Mindat records dull grey to black needles interpreted as pseudomorphs after betekhtinite, commonly chalcocite or bornite. Bornite is also recorded as pseudomorphing after betekhtinite. The locality has additionally produced a lead-rich bornite variety described as âgalenobornite,â in long yellow-brown prismatic crystals to about 3 cm. These unusual relationships make Dzhezkazgan more than a âpretty borniteâ locality; it is a rich copper-sulfide mineralogical system with collector-grade expression.
Quality in Dzhezkazgan bornite is governed by five traits:1. çµæ¶ã®éã: æç¢ºãª faces ãšèªèå¯èœãªæ¬äŒŒçè§åœ¢ç¶ã¯ãããã°ããããéèŠã§ãã 2. 衚é¢ã®å¥å šæ§: æ¬ ããæçã®ãããšããžãé«ªã®æ¯ã»ã©ã®äºè£ã¯äžè¬çã§ãã¯ãªã¢ãªçµæ¶ã«ã¯ãã¬ãã¢ã ãä»ãããšãå€ãã§ãã 3. ã€ããš patina: 埮现ãªéå±çãªéé»è²ãã玫è²ã®å æ²¢ã奜ãŸããéãé»ã被èã人工çã«èŠããè¹è²ãããè©äŸ¡ãé«ãã§ãã 4. åºè³ªã®ã³ã³ãã©ã¹ã: ç³è±ãæ¹è§£ç³ãéæ¶ç³ã®åºè³ªããã«ãã€ããèªã¿åãããããå±ç€ºããããããŸãã 5. åºææ å ±: å€ãã©ãã«ãåä»ããããã³ã¬ã¯ã·ã§ã³ã shaft-specific ãªæ å ±ã¯å€§ããªäŸ¡å€ãå ããŸãã## Collector Notes
Dzhezkazgan bornite is a specialty sulfide for collectors who value crystal form. It should not be confused with the inexpensive âpeacock oreâ commonly sold in metaphysical shops and tourist bins, much of which is acid-treated chalcopyrite or mixed copper sulfide material with an exaggerated rainbow surface. Genuine Dzhezkazgan bornite crystals are typically darker, sharper, more metallic, and more disciplined in form. A specimen that is uniformly neon-purple, electric-blue, and gold over every surface deserves skepticism unless supported by strong provenance and mineralogical context.
The most common condition issues are edge chipping, bruising on exposed crystal corners, hairline cracks, and contact damage where the bornite protruded from matrix. Dealer descriptions of good pieces often still mention tiny chips under magnification; this is realistic for a brittle metallic sulfide from industrial mining. Buyers should inspect the high points of pseudo-octahedral and dodecahedral crystals carefully, as even a small chip can interrupt the geometry that makes the specimen desirable.
Bornite tarnish is part of the specimen, but it is also a surface phenomenon. Avoid aggressive cleaning, acids, ultrasonic cleaning, and repeated handling. The dark iridescent skin can be changed or dulled by chemicals and fingerprints. Store away from excessive humidity, and keep specimens from rubbing against harder minerals in drawers. Quartz matrix is hard; bornite is softer and more vulnerable.
Authenticity concerns center on three issues. First, some pieces are labelled simply âKazakhstanâ or âDzhezkazgan Mineâ without enough detail; this is common and not automatically suspicious, but old collection labels and dealer histories help. Second, mixed copper sulfides can be misidentified visuallyâchalcocite, djurleite, digenite, chalcopyrite, and bornite may occur together. Third, artificially bright âpeacockâ surfaces can distort identification and value. For an expensive specimen, the safest attributes are sharp Dzhezkazgan-style morphology, a credible matrix association, and provenance from a reputable dealer or collection.
Market availability is sporadic. Fine Dzhezkazgan bornite was available in meaningful numbers during the 1990s and early 2000s, but the best crystals are now mostly old-stock or collection material. Current and recent dealer listings show the range: modest miniatures may appear in the low hundreds of dollars, while sharp, undamaged miniatures with multiple bornite crystals on quartz or calcite can reach four figures. A specimen with over a dozen well-formed crystals on calcite was recently listed at $1,750, and a 3.5 cm miniature with three sharp bornite crystals on quartz was listed at $1,250. Cabinet-quality pieces with numerous sharp crystals, excellent matrix contrast, or strong old provenance can be much harder to replace than their size alone suggests.## Stories & Field Notes
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Pohwat, Paul W. (2014), âConnoisseurâs Choice: Bornite, Dzhezkazgan Mine, Dzhezkazgan, Karagandy Province, Kazakhstan,â Rocks & Minerals, 89(6), 530â537 â Dzhezkazganã®éè€ç³ãå°ã察象ãšãããã³ã¬ã¯ã¿ãŒåãã®äž»èŠåºçç©.
Smithsonian Research record for Pohwatâs 2014 Dzhezkazgan bornite article â Rocks & Minerals è«æãš DOI ã®æç®æ å ±ã®ç¢ºèª.
Mindat reference entry for Pohwatâs 2014 article â å®å šãªåç §ããŒã¿ãå«ããæçšãªé±ç©ã³ã¬ã¯ã¿ãŒåãã®æžèªãšã³ããª.
Box, S. E., Seltmann, R., Zientek, M. L., Syusyura, B., Creaser, R. A., and Dolgopolova, A. (2012), âDzhezkazgan and associated sandstone copper deposits of the Chu-Sarysu basin, Central Kazakhstan,â U.S. Geological Survey â æšæºçãªå°è³ªæŠèŠãå ç©äœã®åã幎霢ãå¡©æ°Žéå ã¢ãã«ãåäœãå°åèšå®ãç€ºãæš©åšããæ å ±æº.
Spatial Databases of Geological, Geophysical, and Mineral Resource Data Relevant to Sandstone-Hosted Copper Deposits in Central Kazakhstan, U.S. Geological Survey Open-File Report â åºç¯ãª sandstone-hosted é é±åºè©äŸ¡ã®ããŒã¿æå USGS ãªãœãŒã¹.
Kucha, H., et al. (2021), âOre Minerals and Metal Distribution in Tailings of Sediment-Hosted Stratiform Copper Deposits from Poland and Kazakhstan,â Minerals, 11(7), 752 â Zhezkazgan ã®äž»é±ç©ããã³å°Ÿé±ç©ã®é±ç©åŠã®çŸä»£çèŠçŽãå«ã.
Yerzhanova, A. E. (2021), âTraceological Analysis of Stone Tools of Miners and Metallurgists from Zhezkazgan Copper Deposits,â Povolzhskaya Arkheologiya, 3(37), 166â181 â Zhezkazgan ã®é é±åºåã«ãããBronze Age ã®æ¡æã»å¶éå·¥å ·ã®èå€åŠçç ç©¶.
Mindat locality page for Dzhezkazgan mining district â é±ç©ãªã¹ããçµæ¶æšæ¬ããŒãã竪ååç §ã locality éå±€ã®æ å ±.
Wikimedia Commons file: Bornite on baryte from Dzhezkazgan â å ¬å ±å©çšèš±è«Ÿç»åãDzhezkazganç£ã®ãã©ã€ãäžã®éã9 mmã®æ¬æ£å «é¢äœçµæ¶ã® Bornite ã®åçãå ã³ã¬ã¯ã·ã§ã³ã¯ Martin ZinnãRob Lavinsky ã«ããæ®åœ±.## ãããªãèªæžãšå€éšãªã³ã¯
Mindat: Dzhezkazgan mining district, Karaganda Region, Kazakhstan â ã³ã¬ã¯ã¿ãŒå¿åã® locality ããŒã¿ããŒã¹ãšã³ããªã®æè¯äŸãçš®ã®ãªã¹ããç¿æ§ã shaft ããŒããããã³åèæç®ãå«ãã
USGS: Dzhezkazgan and associated sandstone copper deposits of the Chu-Sarysu basin â ç 岩系é é±åºç³»ã®å¿ é geological backgroundã
Taylor & Francis: âConnoisseurâs Choice: Bornite, Dzhezkazgan MineâŠâ â Dzhezkazgan ã® bornite ã«é¢ããå°çš Rocks & Minerals èšäºã
Wikimedia Commons: Minerals of Dzhezkazgan â district ã®é±ç©ã®èªç±ã©ã€ã»ã³ã¹ç»åãbornite-ãã©ã€ãæšæ¬ãå«ãã
Collectorâs Edge: Bornite, Calcite from Dzhezkazgan â ã³ã¬ã¯ã¿ãŒã³ã¡ã³ãä»ãã®é«çŽ Dzhezkazgan bornite-Calcite æšæ¬ã®çŸåžå ŽäŸã
Marin Mineral Company: Bornite from Dzhezkazgan â ã¯ã©ãŒãäžã®äžã€ã® bornite çµæ¶ãå«ãã·ã£ãŒããªãããã¥ã¢ãèšé²ãããã£ãŒã©äžèЧã
Minfind: Bornite with chalcocite, quartz, baryte, chalcopyrite from Dzhezkazgan â ãµã€ãºãé¢é£ç©ãç¶æ ããŒããç£å°ãå«ãã¢ãŒã«ã€ãæžã¿åžå Žãªã¹ãã
Kazakhmys history â çŸä»£ã® CNC ãã²ã³ã®ãžããºã«ãºã¬ã³é±æ¥ã»å¶ééçºã®äŒæ¥ã¿ã€ã ã©ã€ã³ã
Kazakhstan Ministry of Foreign Affairs: Kanysh Satpayev 125th anniversary article â Satpayev ã® Zhezkazgan é é±åºã®èšŒæãšéçºã«ããã圹å²ã®èŠçŽãªãŒããã«çã
ResearchBib: Traceological Analysis of Stone Tools of Miners and Metallurgists from Zhezkazgan Copper Deposits â Zhezkazgan-Ulytau é å°åã® Bronze Age é 鱿¥ãšå¶éã®æèã