THE PREMIER MARKETPLACE FOR REAL OPALS
Opal Auctions Opals Gem Rock Auctions Gemstones Jewelry Auctioned Jewelry Coins Auctioned Coins
Opal Auctions
登録する ログイン
予約なし
Opal Auctions 予約なしOpal Auctions Gem Rock Auctions 予約なしGem Rock Auctions Jewelry Auctioned 予約なしJewelry Auctioned Coins Auctioned 予約なしCoins Auctioned
No Reserve Opal Auctions Rough Opal Black Opal Boulder Opal
店舗
全店舗
学ぶ
Opal Encyclopedia オパールトリプレット情報 オパールラフカッティングチャンネル 偽オパールの見分け方 オパールのトレンド - 今人気のオパール オパールチャンネル 10月の誕生石 - オパール アウトバックオパールハンターズ TVシリーズ オーストラリアの恐竜のオパール化した骨 オパールはどのように形成されるのでしょうか? オパール オーストラリアの国石

Mintabie Opal

538製品

フィルター

Faceted Mintabie Opal
0
Mintabie Opal Carvings
13
Mintabie Opal Pairs
16
Mintabie Opal Parcels
15
Mintabie Opal Specimens
10
Mintabie Opal Stones
484

キーワード

価格

割引

製品の種類

重さ (CT)

長さ(mm)

幅(mm)

奥行き(mm)

Buy Mintabie Opal

Mintabie opal from South Australia is famous for producing milky white to almost black opal.The Mintabie opal field is situated along the west of the main north-south road between Alice Springs and Adelaide. Compared to other opal fields, this field is populated with malle and mulga trees rising along sandy soil.

Opal Mining methods at Mintabie

The most common form of mining is pit or shaft sinking with pick and shovel, and a hand-operated winch to remove mullock.

Bulldozers and excavators are now commonly used to expose the opal level when it is at relatively shallow depths, then the opal is carefully removed by pick. In deeper areas, shafts are generally sunk by large diameter bucket drills (Calweld drills), then reamed out to allow tunnelling machines, bobcats or boggers to be lowered.

A variety of methods are used to remove the mullock from underground workings:


参考文献