340 pbesident's address. 



system has given way to the very superior mode of ventilation 

 by a Fan, erected at the top of the up-cast shaft, and which drags 

 enormous quantities of air through the underground workings. 



The quantities of coal "drawn" from a colliery varies 

 considerably, as much as 1,000 and even 1,200 tons being in 

 some instances drawn to surface in a day. 



Compressed air is extensively used for underground haulage 

 and pumping ; and electricity is coming much into vogue both 

 for signaling and lighting. 



I have here a table shewing the quantity of coal estimated 

 by the Eoyal Commission as remaining unworked in the South 

 Wales Coal Field, in 1863, first at a depth of less than 4,000 

 feet, and secondly at a greater depth. From this I have had taken 

 the quantity of coal returned as worked since that year, up to 

 1883 inclusive, which gives the result of something over thirty 

 six billion tons of coals remaining unworked at the end of 1883. 

 I also have on this table the total quantities worked at each 

 year for the last twenty years, having increased as will be seen 

 from 8,500,000 tons in 1854, to 24,975,433 tons in 1883. This 

 table will I hope prove satisfactory to our Cornish Miners, as 

 shewing that although a very large quantity of coal is being 

 consumed, yet there remains vast quantities, waiting, as it were 

 to be worked and sent over here and elsewhere to carry on our 

 increasing industries. 



Statistics — South Wales Coaxeield. 



The Royal Coal Commissions' Report gives the following as 

 the quantity of coal remaining unworked : — 



FEET. TONS. 



At a less depth than 4,0l'0 . . 33,285,541,245. 



At a greater depth .. .. 4,108,996,750. 



37,394,537,995. 



Worked up to and inclusive ) imocno/-or> 



-p Ai 1QQO \ •• 1,018,598,689. 



of the year 1883, • • ) r > > 



Coal remaining unworked .. 36,375,939,306. 



Table showing the quantity of coal raised each year, from 

 1864 to 1883 (a period of 20 years), in the Coalfield. 



