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本帖最后由 德道 于 2010-10-30 22:21 编辑
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+ s2 j5 u6 v. @ e1 YBurmite or Burmese amber has been known since the distance past. This amber is from the Hukawng Valley in Kachin
: V/ K; @9 K* Y- g8 ]State the northenmost state in the union of Myanmar formally known as Burma . According to ancient Chinese sources
4 X2 B$ \' K( O& Camber from the Hukawng Valley was mined as early as the first century AD and shipped to Yannan Province in China . . Q5 R) ]7 W* d8 E b6 a" Z
From there, burmite may have found its way along the Silk Road as far west as the Roman Empire , where amber was ' k7 i$ w+ `3 q8 S: } k
highly prized. It is said that that a good piece of amber was worth the price of a slave. The oldest written record referring
" z* o. b1 b( j) P2 W0 F1 Zto Burmese amber was in the Annals of the Han Dynasty (205-265 AD). Thus, burmite has been known for about two
/ Y7 J0 E& @% T* {4 H5 Qthousand years. Much of the exquisitely carved Chinese amber has its origin in the Hukwang Valley . Amber was also
. Q5 I7 A0 m/ p* n% C0 Z. C7 iused and is still used in Chinese medicine. ( \1 T. ]# w0 l7 s! \# B- o5 X1 q
2 b- w: A$ d, L, E9 I# `The first mention of burmite in the western world by a European was by a Portuguese Jesuit Missionary Father Alvarez
w; n. e/ A% h" G! p9 H$ N$ B! MSemedo in 1655. He noted that red amber from Yunnan Province in China . In 1738, there is another brief reference to : ^4 |, A, t, u% U6 E
red amber from Yunnan Province by Du Halde.
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In the 19th Century, there were a series of reports about the location and mining of Burmese amber By Brester (1835)
* T7 [! m4 A. _1 C% f Gand Pemberton (1837). Captain S. F. Hannan was the first westerner to visit the amber mines in the Hukong (Hukawng)
" m: q3 W, k2 CValley. He described the primitive mining method utilized by the miners to recover amber consisting of digging shallow ! O. M0 v( h, D! l1 Z% _2 b
pits with sharpened bamboo and wooden shovels. Description of the amber mines was given by Griffith in 1848 from the
% n; }; z* n3 W. U# C7 a+ s“Hookhoom” Valley. Some pits, he observed were up to forth feet deep.
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7 M' N* o4 n& I. r% F7 AIn 1885, the British invaded and conquered Upper Burma deposing and sent into exile the Burmese Royal Family to
9 g* K9 r8 U! A+ ]India . Burma became an annex of India . With the arrival of the British the main trading route in amber went south to # Y" y. A' `8 x: f) k
Mandalay rather than to China . The Geological Survey of India sent Dr. Fritz Noetling to evaluate the resources of 4 b5 x# \+ Z7 i4 e' a" L+ c. N+ }
northern Burma in 1892. Amber recovered from the Hukwang Valley was examined by Otto Helm who gave the name
8 E1 l! g4 P0 b8 ~' \burmite to the amber from that area. Noetling also noted the presence of insects in amber thought to be from the area in , c) V# \ v! n4 ~1 {0 l. R2 B2 E
1893.
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In the first half of the twentieth century, scientific study and production continues until 1939. With the advent of the 6 z. \7 x) T% X" `0 ]4 P; o y6 n6 m
Second World War, both the production and study languished until the 1990’s. This was due not only to the war but also
+ P% I H% B) ~0 x! C. T( z" I7 Xinternal turmoil within Burma following its independence from Britain in 1947. * G/ y" U( R% e; \% m
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Cockerell (1917) published the first scientific paper on insect inclusions in burmite. He considered burmite to be possibly
: w# Q' K$ z9 v$ r" BUpper Cretaceous in age. The Indian Geological Survey published yearly production figures from the Myitkyina District
* q3 X5 Z, T: f5 }4 p* H) yfrom 1898 until 1940. During this period a total of approximately 82,656 kilograms of amber were produced from the - h7 p2 D f' z
Hukawng Valley . Scientific papers during this period include work by Stuart (1922), Cocherell (1922), Williamson ) W/ y. D! y: W( k5 O$ L
(1932), and Chibber (1934). These authors concluded that the age of burmite was Eocene or about the same age as - L- M* I$ y Y1 r0 g5 ~# t
Baltic amber. This interpretation was based on a single observation of limestone debris dug from one of the amber pits.
0 a$ h, y% P8 s( q3 k) B RChibber (1934) contains the most detailed report of the amber mines in the Hukawng Valley during this period.
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/ w( ?- q: ^6 s0 @During the Second World War there was much fighting in the Hukwang Valley between the advancing allies and the 7 A9 [1 O. ?8 H2 g* \; n
Japanese Army culminating in the fierce battle for Myitkyina the capital of Kachin State in 1944. The war also saw the
/ R7 k9 k4 P3 ?$ W6 bconstruction of the Ledo Road through the Hukwang Valley from Ledo in India to Mytiknina to Lashio where it connected
1 H/ O+ r( X3 ]) }7 dup with the Burma Road to China . This road provided a back door to supply China with desperately needed war ' z% t0 E. K$ r) H: l* A8 G
material. 6 h* _2 n+ c7 Q0 ]
D/ }" Q. @7 H; p0 XSince independence, Burma has been racked by internal insurgencies including fighting between the Kachin
* U2 b' \5 N- P! H, C. b) fIndependence Army (KIA) and the government. It was not until the 1990’s that a peace treaty was signed and limited
. u& p$ u9 h3 `2 y' Laccess to the amber mine was possible. In 1989, the county was renamed Myanmar , which was the original Burmese
; X: w6 f2 Z) [name of the country. M$ P- ~- K. {. I L4 ]
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Since the beginning of the Second World War until recently there was been a sixty year hiatus in production. Dr. David + s5 p, c. r! R' |6 @
Grimaldi comments in his book on amber published in 1996, “Today, burmite has almost legendary appeal, in part
) Q, t5 H2 W# b4 Q1 |because the deposits are no longer mined and the supply is generally not available.”
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Leeward Capital Corp., a Canadian Mining company began exploration in 1996 in northern Kachin State for gold and 9 ~" [9 x3 H% L4 i1 Y
platinum. With the collapse of the junior mining market due to the Bre-X Scandal in Indonesia and the drop in the gold
5 N; ?3 x- O" [# C$ G! iprice, this exploration ceased due to the lack of funding. In 1999, Leeward began to evaluate the possibility of reopening ( j% O8 _7 {, R; _2 T
the amber mines in the Hukwang Valley . Limited production was achieved in 2000, and is currently about 500 kg per ' g9 T0 l6 X. @$ Q4 @$ ], a, a
year. The initial 100 kg gathered in the first two years was sent to Dr. Grimaldi at the American Museum of Natural
( v! S& _& y2 t/ _$ rHistory in New York for scientific study. In 2000, Zherikjin and Ross of the Natural History Museum , London published a . ^: r/ L1 H9 W% H! ~
scientific paper on burmite in which they determined a Cretaceous age for burmite. Grimaldi et al (2002) published a
: k5 f3 e p% l6 @scientific paper confirming the age of burmite as Cretaceous. Also in 2002, Cruichshank and U Ko Ko published a ) a: R: Z: c4 B
description of the amber mines in the Hukwang Valley giving the amber a an Albian or uppermost Lower Cretaceous
8 z3 M& Q) w G# Yage. This dates burmite as at between 100,000,000 and 110,000,000 years old. Burmite is thus the oldest locality from
+ m, @$ ]4 H/ rwhich commercial deposits of amber can be mined. Leeward remains the sole exporter of this rare and precious amber.
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9 o8 v9 @( N+ C# V# ]/ GSince scientific study of burmite began, there have been numerous scientific papers on the unique biota found in 1 x( y0 d% H9 G, \
burmite. This book illustrates the diversity of animal and plant life preserved in this ancient amber. 5 I& W% l& s3 |) M& R& g" p
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