|
本帖最后由 德道 于 2010-10-30 22:21 编辑
, t4 ?2 a# Z$ P/ ~8 W3 ~. ~. \9 b' `' T
Burmite or Burmese amber has been known since the distance past. This amber is from the Hukawng Valley in Kachin
7 v% W1 d. p1 n7 ]' Q1 gState the northenmost state in the union of Myanmar formally known as Burma . According to ancient Chinese sources
0 F) w! g% [/ g- E: Q7 eamber from the Hukawng Valley was mined as early as the first century AD and shipped to Yannan Province in China . # @ r, H' e* r. |" S; C
From there, burmite may have found its way along the Silk Road as far west as the Roman Empire , where amber was 3 H. ? d# j( z& K6 ?
highly prized. It is said that that a good piece of amber was worth the price of a slave. The oldest written record referring % S* P$ E- D+ P0 \: M- C. x* E4 s
to Burmese amber was in the Annals of the Han Dynasty (205-265 AD). Thus, burmite has been known for about two
' m9 \: ^5 |7 j& bthousand years. Much of the exquisitely carved Chinese amber has its origin in the Hukwang Valley . Amber was also
, P" ~0 S/ t4 s" aused and is still used in Chinese medicine. * g& a# n2 P6 ~: U. Z. v9 ?
' Q$ e$ Z" A0 S% r4 n2 vThe first mention of burmite in the western world by a European was by a Portuguese Jesuit Missionary Father Alvarez
8 V S: d9 I) s7 rSemedo in 1655. He noted that red amber from Yunnan Province in China . In 1738, there is another brief reference to 8 L$ S: n5 k& g1 R! U% Q$ }/ \
red amber from Yunnan Province by Du Halde.
9 Y; Q2 b) i! i' j6 R* Y
1 u% J* z) o) y/ ^5 X4 p% nIn the 19th Century, there were a series of reports about the location and mining of Burmese amber By Brester (1835) : {9 {8 g0 ^! w& t j) {0 r* i% q6 h
and Pemberton (1837). Captain S. F. Hannan was the first westerner to visit the amber mines in the Hukong (Hukawng) 4 G! y) A, O, S- r
Valley. He described the primitive mining method utilized by the miners to recover amber consisting of digging shallow 2 l3 }! j2 K, B, I3 t
pits with sharpened bamboo and wooden shovels. Description of the amber mines was given by Griffith in 1848 from the
# H4 |4 `6 b" D" g0 Q“Hookhoom” Valley. Some pits, he observed were up to forth feet deep.
2 d& D5 J' G' q( h' \- J/ L- R/ S* z. V3 |- Y5 v+ R( R6 l* V2 [
In 1885, the British invaded and conquered Upper Burma deposing and sent into exile the Burmese Royal Family to ' q' k3 V# Q( w- c# H2 S; \
India . Burma became an annex of India . With the arrival of the British the main trading route in amber went south to
% p- P. O$ \& ?/ L$ {, Y! P: KMandalay rather than to China . The Geological Survey of India sent Dr. Fritz Noetling to evaluate the resources of
% M E* o8 ]' Y6 A: Z/ Tnorthern Burma in 1892. Amber recovered from the Hukwang Valley was examined by Otto Helm who gave the name
" W2 u- D+ ~8 U5 {" J" d5 Aburmite to the amber from that area. Noetling also noted the presence of insects in amber thought to be from the area in
3 q v( \) d& F) N. t1893.
" K7 c. w- M( h }: @" R4 y% v7 _) x4 L- E# W2 z5 v: K& L
In the first half of the twentieth century, scientific study and production continues until 1939. With the advent of the 9 w3 R4 |% ~$ U& ?$ w: U/ l8 c
Second World War, both the production and study languished until the 1990’s. This was due not only to the war but also . u( o1 i& t! R2 C4 K& U
internal turmoil within Burma following its independence from Britain in 1947. 5 J- F( }0 O! s: l; e( R: o) n
- L6 _" n R" ^! c$ R# P7 _
Cockerell (1917) published the first scientific paper on insect inclusions in burmite. He considered burmite to be possibly
$ N' v5 Q) K! T9 zUpper Cretaceous in age. The Indian Geological Survey published yearly production figures from the Myitkyina District
/ E" R# b, D( [, X5 o, pfrom 1898 until 1940. During this period a total of approximately 82,656 kilograms of amber were produced from the
* C/ Q; Y% o6 ?6 B3 SHukawng Valley . Scientific papers during this period include work by Stuart (1922), Cocherell (1922), Williamson
* S N( w2 e6 k0 X7 z6 D(1932), and Chibber (1934). These authors concluded that the age of burmite was Eocene or about the same age as , t% Q5 s5 U- O! h/ z# d
Baltic amber. This interpretation was based on a single observation of limestone debris dug from one of the amber pits. 2 o8 w& W" a4 r% C- V0 ]
Chibber (1934) contains the most detailed report of the amber mines in the Hukawng Valley during this period.
( ] k$ h& S( e
8 M2 j2 Y$ o4 s t4 n: ?During the Second World War there was much fighting in the Hukwang Valley between the advancing allies and the ) m& j# b# o, ]3 g: F: n
Japanese Army culminating in the fierce battle for Myitkyina the capital of Kachin State in 1944. The war also saw the + x B4 C: I! [
construction of the Ledo Road through the Hukwang Valley from Ledo in India to Mytiknina to Lashio where it connected
( X! k% F! V7 N" fup with the Burma Road to China . This road provided a back door to supply China with desperately needed war $ v- x, q/ J' [( B, L8 x8 i+ _5 _
material.
6 N+ X3 M4 b5 r: e
4 K7 q* b4 e) Z$ L, F( m/ mSince independence, Burma has been racked by internal insurgencies including fighting between the Kachin
3 X/ J) l5 t2 P, T) V3 E' TIndependence Army (KIA) and the government. It was not until the 1990’s that a peace treaty was signed and limited
2 `9 ]$ g, W" _" s7 B8 N2 ^7 \access to the amber mine was possible. In 1989, the county was renamed Myanmar , which was the original Burmese
# b8 t) S. q& p! i2 t; K& I2 rname of the country.
2 N( L+ H7 h, W/ M& v& c
% f1 k0 j+ n; v9 }: I' U. ]Since the beginning of the Second World War until recently there was been a sixty year hiatus in production. Dr. David
0 ?8 } q" H' g& s8 V1 W; LGrimaldi comments in his book on amber published in 1996, “Today, burmite has almost legendary appeal, in part ; a; [- h$ R5 ^0 Y) X( Z& S: {4 A+ z
because the deposits are no longer mined and the supply is generally not available.”
7 `5 r, W+ z" c& M
; e5 m* }# _& U' WLeeward Capital Corp., a Canadian Mining company began exploration in 1996 in northern Kachin State for gold and - l4 F( P% X* C- o% u
platinum. With the collapse of the junior mining market due to the Bre-X Scandal in Indonesia and the drop in the gold [( b1 o- w9 i' g
price, this exploration ceased due to the lack of funding. In 1999, Leeward began to evaluate the possibility of reopening - l4 \9 X h6 J$ C1 L5 e6 `
the amber mines in the Hukwang Valley . Limited production was achieved in 2000, and is currently about 500 kg per
\2 R Q' A/ X& Cyear. The initial 100 kg gathered in the first two years was sent to Dr. Grimaldi at the American Museum of Natural
( M8 X! }( |4 I2 _History in New York for scientific study. In 2000, Zherikjin and Ross of the Natural History Museum , London published a
2 a1 U/ ^: T% [6 J) e/ V$ iscientific paper on burmite in which they determined a Cretaceous age for burmite. Grimaldi et al (2002) published a 4 L! D+ G, z) N1 \$ T6 ?
scientific paper confirming the age of burmite as Cretaceous. Also in 2002, Cruichshank and U Ko Ko published a ( R5 P8 }2 I7 R- `: r) n
description of the amber mines in the Hukwang Valley giving the amber a an Albian or uppermost Lower Cretaceous
+ g3 m* L X$ N' l# x6 B- Yage. This dates burmite as at between 100,000,000 and 110,000,000 years old. Burmite is thus the oldest locality from 6 X/ l5 Z* \' L
which commercial deposits of amber can be mined. Leeward remains the sole exporter of this rare and precious amber.
; b: Q0 M0 O: C. O5 l' o/ R- ]( U& j3 t4 C
Since scientific study of burmite began, there have been numerous scientific papers on the unique biota found in & B' N8 X& V5 ?2 F! Z( M
burmite. This book illustrates the diversity of animal and plant life preserved in this ancient amber. - h- J( _1 o: L# r, _/ _$ C* Q
|
|