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本帖最后由 德道 于 2010-10-30 22:21 编辑
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Burmite or Burmese amber has been known since the distance past. This amber is from the Hukawng Valley in Kachin
9 d4 B, l$ {* X) }# YState the northenmost state in the union of Myanmar formally known as Burma . According to ancient Chinese sources
3 P/ k9 ^4 C8 Q6 @amber from the Hukawng Valley was mined as early as the first century AD and shipped to Yannan Province in China . 3 O. V D! \2 X
From there, burmite may have found its way along the Silk Road as far west as the Roman Empire , where amber was
+ V. s1 i. M2 E9 O) ahighly prized. It is said that that a good piece of amber was worth the price of a slave. The oldest written record referring 6 ~! V) p; ?/ l& n" f9 C
to Burmese amber was in the Annals of the Han Dynasty (205-265 AD). Thus, burmite has been known for about two ; C5 Q5 V4 e8 I, c) a* A
thousand years. Much of the exquisitely carved Chinese amber has its origin in the Hukwang Valley . Amber was also
# d$ Y, K. u5 z2 pused and is still used in Chinese medicine.
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) V [8 ]) p5 @7 c) ~2 gThe first mention of burmite in the western world by a European was by a Portuguese Jesuit Missionary Father Alvarez
: Z. T' |4 H7 E; r5 t: XSemedo in 1655. He noted that red amber from Yunnan Province in China . In 1738, there is another brief reference to
; c2 a/ ~; t3 j) I& X4 x9 j: A5 Cred amber from Yunnan Province by Du Halde. # ?, l; V) a7 p! d
) _) l2 q7 s0 n2 J9 `In the 19th Century, there were a series of reports about the location and mining of Burmese amber By Brester (1835)
& A( v9 F8 M9 x7 ^0 vand Pemberton (1837). Captain S. F. Hannan was the first westerner to visit the amber mines in the Hukong (Hukawng) + W n8 Z1 e @: i0 b
Valley. He described the primitive mining method utilized by the miners to recover amber consisting of digging shallow
6 g U1 D* e9 I$ s8 @; n2 ]pits with sharpened bamboo and wooden shovels. Description of the amber mines was given by Griffith in 1848 from the 3 P0 T3 N3 E* _; f! J
“Hookhoom” Valley. Some pits, he observed were up to forth feet deep. & ^. l/ Y6 ~. g1 k. ^3 S9 ^( |
" O! \1 W3 D, U8 a* W8 I9 j) LIn 1885, the British invaded and conquered Upper Burma deposing and sent into exile the Burmese Royal Family to
/ `" [) u; d, qIndia . Burma became an annex of India . With the arrival of the British the main trading route in amber went south to
/ w2 j5 q: M9 B$ A* ^$ F/ b+ Q& NMandalay rather than to China . The Geological Survey of India sent Dr. Fritz Noetling to evaluate the resources of
" }8 S2 X8 s% b% L; \, n' Xnorthern Burma in 1892. Amber recovered from the Hukwang Valley was examined by Otto Helm who gave the name
* D7 o1 c" Q; `7 wburmite to the amber from that area. Noetling also noted the presence of insects in amber thought to be from the area in 1 o. {' |/ @2 }: X
1893. ' m* S6 k! ~- l% e: P8 _9 G1 U
* y5 a0 e! W# ZIn the first half of the twentieth century, scientific study and production continues until 1939. With the advent of the + x8 F) _5 _; T0 G3 {
Second World War, both the production and study languished until the 1990’s. This was due not only to the war but also
) e0 |( x% l$ q: I% k4 X! iinternal turmoil within Burma following its independence from Britain in 1947.
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Cockerell (1917) published the first scientific paper on insect inclusions in burmite. He considered burmite to be possibly
3 }# S) Q; A& o, X0 bUpper Cretaceous in age. The Indian Geological Survey published yearly production figures from the Myitkyina District % Y! [6 g; K& [9 }5 K
from 1898 until 1940. During this period a total of approximately 82,656 kilograms of amber were produced from the 1 d" Y% Q3 p$ k, D
Hukawng Valley . Scientific papers during this period include work by Stuart (1922), Cocherell (1922), Williamson
# P, x0 g- |/ K) a. n" y( W( T) v(1932), and Chibber (1934). These authors concluded that the age of burmite was Eocene or about the same age as 9 F8 Q# A5 Z8 p1 k5 @
Baltic amber. This interpretation was based on a single observation of limestone debris dug from one of the amber pits.
$ {& M! _# M& ^1 D6 jChibber (1934) contains the most detailed report of the amber mines in the Hukawng Valley during this period. ; Z2 p. B9 U" h* T
1 ?% l) K0 E; r- ~/ e2 RDuring the Second World War there was much fighting in the Hukwang Valley between the advancing allies and the
L* x6 t: l9 Y* w( T6 {Japanese Army culminating in the fierce battle for Myitkyina the capital of Kachin State in 1944. The war also saw the
0 n+ Y4 Z3 Q+ u) h; W3 }; _* fconstruction of the Ledo Road through the Hukwang Valley from Ledo in India to Mytiknina to Lashio where it connected ) {2 a. d* |/ ?9 L+ w3 [3 ]9 M ~% l
up with the Burma Road to China . This road provided a back door to supply China with desperately needed war
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) f0 I, b* X, u* j0 v" D H* zSince independence, Burma has been racked by internal insurgencies including fighting between the Kachin
9 F$ H4 Y, I! _4 `! m0 m# |( VIndependence Army (KIA) and the government. It was not until the 1990’s that a peace treaty was signed and limited
R6 s5 _6 @" p H. d9 qaccess to the amber mine was possible. In 1989, the county was renamed Myanmar , which was the original Burmese
7 g' V- e( l$ M& hname of the country. " Y5 R/ S- I- w: n6 v2 d
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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
/ r. C! x" _9 Z: CGrimaldi comments in his book on amber published in 1996, “Today, burmite has almost legendary appeal, in part
K) o# E% a- ]" p) [+ v; Q. u( nbecause 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 ! u, o% K8 b' F/ g6 I& ]
platinum. With the collapse of the junior mining market due to the Bre-X Scandal in Indonesia and the drop in the gold & L+ I& y, a' O$ S: A
price, this exploration ceased due to the lack of funding. In 1999, Leeward began to evaluate the possibility of reopening / r' a' d# T G( f- w
the amber mines in the Hukwang Valley . Limited production was achieved in 2000, and is currently about 500 kg per & [$ A9 O" q9 s6 b
year. The initial 100 kg gathered in the first two years was sent to Dr. Grimaldi at the American Museum of Natural
5 K, D! Q. W; G/ r8 KHistory in New York for scientific study. In 2000, Zherikjin and Ross of the Natural History Museum , London published a . c9 F5 u+ O* ~* V
scientific paper on burmite in which they determined a Cretaceous age for burmite. Grimaldi et al (2002) published a - @4 g h9 }& q0 y) _7 z. r
scientific paper confirming the age of burmite as Cretaceous. Also in 2002, Cruichshank and U Ko Ko published a 6 S6 a3 o! b& z9 A/ M7 {' Q6 ~1 C
description of the amber mines in the Hukwang Valley giving the amber a an Albian or uppermost Lower Cretaceous
! n5 @1 v5 V4 s0 Fage. This dates burmite as at between 100,000,000 and 110,000,000 years old. Burmite is thus the oldest locality from . s. B2 l/ `# m8 n8 q
which commercial deposits of amber can be mined. Leeward remains the sole exporter of this rare and precious amber.
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Since scientific study of burmite began, there have been numerous scientific papers on the unique biota found in
2 V- {$ z3 E" Q; {* E3 l, |$ k, _burmite. This book illustrates the diversity of animal and plant life preserved in this ancient amber.
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