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本帖最后由 德道 于 2010-10-30 22:21 编辑 + t( U; P" p# ^6 T) P$ J1 e8 r3 O
0 l+ u0 n* r+ I5 F5 b2 p2 eBurmite or Burmese amber has been known since the distance past. This amber is from the Hukawng Valley in Kachin
" @' M3 K$ U% q l5 M% z1 oState the northenmost state in the union of Myanmar formally known as Burma . According to ancient Chinese sources
6 q: G" E3 ~0 {! l: P! I: [" }) }amber from the Hukawng Valley was mined as early as the first century AD and shipped to Yannan Province in China .
0 N" n: X/ q6 H+ KFrom there, burmite may have found its way along the Silk Road as far west as the Roman Empire , where amber was
3 |3 c1 B' Z8 A; f3 `! ?4 ~highly prized. It is said that that a good piece of amber was worth the price of a slave. The oldest written record referring
. F5 v( u W- Oto Burmese amber was in the Annals of the Han Dynasty (205-265 AD). Thus, burmite has been known for about two 9 ?7 p. @( X# g' ~' _
thousand years. Much of the exquisitely carved Chinese amber has its origin in the Hukwang Valley . Amber was also * |/ z, {1 W3 U# j
used and is still used in Chinese medicine. + M4 o1 q$ H) _0 P, j7 P) ^
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The first mention of burmite in the western world by a European was by a Portuguese Jesuit Missionary Father Alvarez
' w& m- w& I( Q# D. fSemedo in 1655. He noted that red amber from Yunnan Province in China . In 1738, there is another brief reference to 3 P' Q9 D% r# Q6 c+ u8 R
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) 2 V1 A# T# B2 e u9 x, p) G2 \
and Pemberton (1837). Captain S. F. Hannan was the first westerner to visit the amber mines in the Hukong (Hukawng)
* x) ~$ e, w6 l0 ]Valley. He described the primitive mining method utilized by the miners to recover amber consisting of digging shallow 5 }( H. E4 b/ x. i4 f5 e
pits with sharpened bamboo and wooden shovels. Description of the amber mines was given by Griffith in 1848 from the 7 w' j4 e7 K0 X& C
“Hookhoom” Valley. Some pits, he observed were up to forth feet deep.
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In 1885, the British invaded and conquered Upper Burma deposing and sent into exile the Burmese Royal Family to
) r* I/ M) E; ?6 L9 F+ I4 EIndia . Burma became an annex of India . With the arrival of the British the main trading route in amber went south to
% W- u3 D& c0 I! Y8 K# gMandalay rather than to China . The Geological Survey of India sent Dr. Fritz Noetling to evaluate the resources of
3 O1 {+ f% G1 `7 mnorthern Burma in 1892. Amber recovered from the Hukwang Valley was examined by Otto Helm who gave the name
% x! p% x5 Q$ s) V; n, I$ h) S, u* wburmite to the amber from that area. Noetling also noted the presence of insects in amber thought to be from the area in
; l8 ~5 l, I; u( g @: M1893. / Z1 k. d5 X- d; k1 q. w
$ P: a4 h w; k' M2 ]% n! JIn the first half of the twentieth century, scientific study and production continues until 1939. With the advent of the
# |. \& Z+ e( y$ A0 l/ y; m6 ~Second World War, both the production and study languished until the 1990’s. This was due not only to the war but also
$ |* @& R2 k* Q2 r( o- binternal turmoil within Burma following its independence from Britain in 1947.
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8 n! Z! p% s& J. I4 WCockerell (1917) published the first scientific paper on insect inclusions in burmite. He considered burmite to be possibly 2 r: o6 R6 }( M1 E, m' G
Upper Cretaceous in age. The Indian Geological Survey published yearly production figures from the Myitkyina District
& s4 |9 p- ^, z! P4 H2 ^% V& Rfrom 1898 until 1940. During this period a total of approximately 82,656 kilograms of amber were produced from the # Z3 x" _: S- b2 c1 v5 R4 o
Hukawng Valley . Scientific papers during this period include work by Stuart (1922), Cocherell (1922), Williamson
& x4 J6 s& R$ G# k( Z(1932), and Chibber (1934). These authors concluded that the age of burmite was Eocene or about the same age as
2 s$ R) v" V8 T3 y9 [! ZBaltic amber. This interpretation was based on a single observation of limestone debris dug from one of the amber pits.
9 \+ L L! `3 _2 Q- HChibber (1934) contains the most detailed report of the amber mines in the Hukawng Valley during this period. " I' _2 m, Q3 n# [: b
5 X% b$ f8 l& v* ?; BDuring the Second World War there was much fighting in the Hukwang Valley between the advancing allies and the ) E/ c! Z8 c2 j7 n, I
Japanese Army culminating in the fierce battle for Myitkyina the capital of Kachin State in 1944. The war also saw the 7 u ~" g/ t% f6 f1 y8 _
construction of the Ledo Road through the Hukwang Valley from Ledo in India to Mytiknina to Lashio where it connected 4 Z/ t+ W2 L X1 t) I7 b: q: b
up with the Burma Road to China . This road provided a back door to supply China with desperately needed war
$ y) F: R+ W* Z- Hmaterial. : n5 F9 u; S" l# f/ w
5 e$ E0 D2 Q6 M3 d7 Z3 p6 ~Since independence, Burma has been racked by internal insurgencies including fighting between the Kachin + }, k+ p# e/ e' ]
Independence Army (KIA) and the government. It was not until the 1990’s that a peace treaty was signed and limited * ]6 M6 D# Z! ~$ m1 S; ?
access to the amber mine was possible. In 1989, the county was renamed Myanmar , which was the original Burmese / U$ v# H* c' g' H p; R
name of the country. % f4 `: i# T+ R6 t: @# V5 o$ K& `
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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 8 }8 b$ Z2 J6 D5 C2 N1 q C, e( N
Grimaldi comments in his book on amber published in 1996, “Today, burmite has almost legendary appeal, in part , f( N* {9 s+ \3 t6 N# U; X y
because the deposits are no longer mined and the supply is generally not available.” 7 P3 \% `# a5 T F* ]
/ `- V m Z2 d7 V1 L, {' ~/ [. I/ aLeeward Capital Corp., a Canadian Mining company began exploration in 1996 in northern Kachin State for gold and
$ @ j4 g6 D7 h& Iplatinum. With the collapse of the junior mining market due to the Bre-X Scandal in Indonesia and the drop in the gold
" [' a) l u' bprice, this exploration ceased due to the lack of funding. In 1999, Leeward began to evaluate the possibility of reopening
+ l8 i7 f0 I: B9 V' a- M+ J# q( S: vthe amber mines in the Hukwang Valley . Limited production was achieved in 2000, and is currently about 500 kg per
& y7 C* r2 I$ V- B: M" C% ?$ fyear. The initial 100 kg gathered in the first two years was sent to Dr. Grimaldi at the American Museum of Natural
' s& Q5 B- J# E& y% B2 S% e1 y, yHistory in New York for scientific study. In 2000, Zherikjin and Ross of the Natural History Museum , London published a ! n9 d( z( N7 `5 }
scientific paper on burmite in which they determined a Cretaceous age for burmite. Grimaldi et al (2002) published a * H1 J2 z3 }! P! l5 `
scientific paper confirming the age of burmite as Cretaceous. Also in 2002, Cruichshank and U Ko Ko published a ( J/ f4 _/ T. v- L; O
description of the amber mines in the Hukwang Valley giving the amber a an Albian or uppermost Lower Cretaceous * o$ c9 A% y$ C' f, q8 T. u9 |2 k
age. This dates burmite as at between 100,000,000 and 110,000,000 years old. Burmite is thus the oldest locality from
- s. @0 t6 |- }; M5 vwhich 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
9 j7 O2 L- j! C& ?) d" u, \# v8 cburmite. This book illustrates the diversity of animal and plant life preserved in this ancient amber. ' \! H: o+ g. K: X* k
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