|
本帖最后由 德道 于 2010-10-30 22:21 编辑 & D6 |* Q0 h% Y; ?
% r5 H2 G& l+ r( \ M5 UBurmite or Burmese amber has been known since the distance past. This amber is from the Hukawng Valley in Kachin , k8 W% Z7 ]3 y0 x: K$ [
State the northenmost state in the union of Myanmar formally known as Burma . According to ancient Chinese sources
% y7 ~' S. S5 A/ Samber from the Hukawng Valley was mined as early as the first century AD and shipped to Yannan Province in China . K# `0 \; K7 j: }
From there, burmite may have found its way along the Silk Road as far west as the Roman Empire , where amber was
4 c) V+ M' `7 C* z$ j( zhighly prized. It is said that that a good piece of amber was worth the price of a slave. The oldest written record referring
~$ [; \+ F. @0 vto Burmese amber was in the Annals of the Han Dynasty (205-265 AD). Thus, burmite has been known for about two
2 G: B& b* W [; h; Uthousand years. Much of the exquisitely carved Chinese amber has its origin in the Hukwang Valley . Amber was also ' o: ^ H2 O( b9 Y
used and is still used in Chinese medicine. * A/ ~5 T. R) d8 |( q) C% ?
) }, q$ `: z$ I9 E% C- ]% P! s2 {The first mention of burmite in the western world by a European was by a Portuguese Jesuit Missionary Father Alvarez 9 ?4 ~) P( C1 h+ {" y. S9 H
Semedo in 1655. He noted that red amber from Yunnan Province in China . In 1738, there is another brief reference to
- j6 @8 B! O- ^red amber from Yunnan Province by Du Halde.
) S, N1 ~% P$ ^0 m1 X! n" K
5 H9 J6 J; G% W* u. ~9 N) YIn the 19th Century, there were a series of reports about the location and mining of Burmese amber By Brester (1835)
6 Q# b/ D2 C& o# X& V* T6 iand Pemberton (1837). Captain S. F. Hannan was the first westerner to visit the amber mines in the Hukong (Hukawng) ; d3 I, K; q$ y8 i% P4 ~
Valley. He described the primitive mining method utilized by the miners to recover amber consisting of digging shallow
: v3 {2 L: p4 w( F8 d" L5 U, z0 Kpits with sharpened bamboo and wooden shovels. Description of the amber mines was given by Griffith in 1848 from the * C8 C2 q( m F! m3 G3 D
“Hookhoom” Valley. Some pits, he observed were up to forth feet deep.
4 i: t. Z) s, u2 D0 v% w7 N) ^$ s4 m4 Y$ d, s% b! X! d; j6 I
In 1885, the British invaded and conquered Upper Burma deposing and sent into exile the Burmese Royal Family to
# O- E+ e( v: ^# y+ }& t1 H. JIndia . Burma became an annex of India . With the arrival of the British the main trading route in amber went south to
# E; {3 @" b; ?1 E& nMandalay rather than to China . The Geological Survey of India sent Dr. Fritz Noetling to evaluate the resources of 9 R$ D9 J# P4 c0 y! {* G
northern Burma in 1892. Amber recovered from the Hukwang Valley was examined by Otto Helm who gave the name
7 m* M% j' r9 z: Q7 P$ w/ Zburmite to the amber from that area. Noetling also noted the presence of insects in amber thought to be from the area in . h6 s- p7 v! B3 T. o, d/ e3 E
1893. " e7 P) I3 ]) M: m: Z& G! _
. i, v- B7 i# b$ M* l
In the first half of the twentieth century, scientific study and production continues until 1939. With the advent of the ; B- w3 F& H$ `: p* s7 \: [! Y
Second World War, both the production and study languished until the 1990’s. This was due not only to the war but also 9 M6 i( V! y3 m1 {& s5 N
internal turmoil within Burma following its independence from Britain in 1947.
# l n e5 r W+ e
8 j3 j1 e$ S9 A4 @5 P, L$ ~. YCockerell (1917) published the first scientific paper on insect inclusions in burmite. He considered burmite to be possibly - P* |) W* y+ S( ?5 u& @
Upper Cretaceous in age. The Indian Geological Survey published yearly production figures from the Myitkyina District
3 O6 R; C) j& S' n6 v hfrom 1898 until 1940. During this period a total of approximately 82,656 kilograms of amber were produced from the
8 x, Q# L; s1 Z- [; R) W! ~ _Hukawng Valley . Scientific papers during this period include work by Stuart (1922), Cocherell (1922), Williamson # p6 T2 v) @* T* u
(1932), and Chibber (1934). These authors concluded that the age of burmite was Eocene or about the same age as
8 w) W# w' b* e* V! TBaltic amber. This interpretation was based on a single observation of limestone debris dug from one of the amber pits.
G+ C+ y( u# D& c5 R8 l9 e6 cChibber (1934) contains the most detailed report of the amber mines in the Hukawng Valley during this period. X3 g! A1 K1 J. W
* t# \& L) g) C/ q* ?
During the Second World War there was much fighting in the Hukwang Valley between the advancing allies and the
- I4 x) m4 a( `* m; {6 }3 [7 pJapanese Army culminating in the fierce battle for Myitkyina the capital of Kachin State in 1944. The war also saw the ' s* A. E5 @0 e; r
construction of the Ledo Road through the Hukwang Valley from Ledo in India to Mytiknina to Lashio where it connected
' g' L, N; L7 ` n' _up with the Burma Road to China . This road provided a back door to supply China with desperately needed war - I; C( j" v+ a4 H+ p5 q$ q# U: q
material. 9 W, j: b( |. F5 O7 q( J/ f
& U& [8 J) d& r3 e7 O, N" f1 PSince independence, Burma has been racked by internal insurgencies including fighting between the Kachin ; J5 U+ v1 V/ S$ ?6 p6 e( }; ]
Independence Army (KIA) and the government. It was not until the 1990’s that a peace treaty was signed and limited / n" a) Z$ |! h, e3 h/ F
access to the amber mine was possible. In 1989, the county was renamed Myanmar , which was the original Burmese
/ V/ l' Q$ O7 xname of the country. $ ?. k( a5 Y p- @7 |% K" K8 o
' Y# C& ~, X, u- _0 L2 z
Since the beginning of the Second World War until recently there was been a sixty year hiatus in production. Dr. David ' Q3 S$ Z' _7 D) k; N, {
Grimaldi comments in his book on amber published in 1996, “Today, burmite has almost legendary appeal, in part
. w& @( i* n; p, u+ L! N! Lbecause the deposits are no longer mined and the supply is generally not available.” - Z/ |' p- F9 g0 _, \8 r$ h
8 d+ ^. M9 M% h+ e( XLeeward Capital Corp., a Canadian Mining company began exploration in 1996 in northern Kachin State for gold and
* |' b4 {% b2 W1 ^platinum. With the collapse of the junior mining market due to the Bre-X Scandal in Indonesia and the drop in the gold 9 E! Q" O5 W" p0 p
price, this exploration ceased due to the lack of funding. In 1999, Leeward began to evaluate the possibility of reopening
+ C9 Q% a# H7 o5 V5 \+ \& h; Lthe amber mines in the Hukwang Valley . Limited production was achieved in 2000, and is currently about 500 kg per
1 L ]6 Y4 g7 _$ l0 }# W: Wyear. The initial 100 kg gathered in the first two years was sent to Dr. Grimaldi at the American Museum of Natural + W$ V( e. s) \/ d
History in New York for scientific study. In 2000, Zherikjin and Ross of the Natural History Museum , London published a
3 S( p9 k1 g; \scientific paper on burmite in which they determined a Cretaceous age for burmite. Grimaldi et al (2002) published a
& m, q6 {' u9 Z! Kscientific paper confirming the age of burmite as Cretaceous. Also in 2002, Cruichshank and U Ko Ko published a " W5 N6 F6 h) Z6 I( C
description of the amber mines in the Hukwang Valley giving the amber a an Albian or uppermost Lower Cretaceous
! G2 x* u- @7 Dage. This dates burmite as at between 100,000,000 and 110,000,000 years old. Burmite is thus the oldest locality from 0 k! o M0 z. v$ K$ K
which commercial deposits of amber can be mined. Leeward remains the sole exporter of this rare and precious amber. % S N4 f3 a- h% `
, e) p5 E1 c1 B, m3 y
Since scientific study of burmite began, there have been numerous scientific papers on the unique biota found in " \' c" b% Y0 L0 G' P' a9 d
burmite. This book illustrates the diversity of animal and plant life preserved in this ancient amber.
0 j# P7 S0 z- \" Q5 g |
|