Longwall Coal Mining pib hauv Great Britain Cov neeg tshawb nrhiav keeb kwm pom tias txoj kev longwall pib hauv Great Britain thaum xyoo 1600s hauv Shropshire County (Galloway 1882, Hatcher 1993).
Thaum twg longwall mining pib?
Lwm txoj hauv kev tseem ceeb ntawm kev ua haujlwm niaj hnub no, kev ua haujlwm ntev ntev, tau qhia thaum ntxov li 17th caug xyoo thiab tau pom dav siv los ntawm lub xyoo pua 19th, tab sis nws tau ntev lawm. Ua haujlwm tsawg dua li chav thiab ncej mining.
Yuav ua li cas yog txoj kev longwall hauv mining?
longwall mining Longwall mining yog ib txoj hauv av ntawm kev khawb cov thee los ntawm cov ntawv tso nyiaj, nrog rau cov pob zeb mos xws li potash. Cov pob zeb loj ntawm cov thee tau txhais thaum lub sijhawm txhim kho ntawm cov mine thiab muab rho tawm hauv ib qho kev ua haujlwm tas mus li.
Thaum twg cov thee mining pib?
Anthracite thee mining pib nyob ib ncig ntawm 1775 nyob rau sab qaum teb sab hnub tuaj Pennsylvania thiab, los ntawm lig 1700s, thee tau mined hauv Mount Washington, hauv Pittsburgh. Tsis ntev tom qab ntawd, kev lag luam thee pib hauv Ohio, Illinois, thiab lwm lub xeev.
Dab tsi yog Sylvester hauv mining?
W alter Sylvester (18 Kaum Ob Hlis 1867 - 30 Lub Kaum Hli 1944) yog tus kws tsim txuj ci Askiv, paub txog "Sylvester", khoom siv rau kev nyab xeeb tshem cov khoom hauv mines.