RECENT L Y PA TENTED IMPR VEMENTS. 
637 
The value of the product, 1,114,040 tons, at $2.25 per ton, is $2,506,590. 
Colorado Coal AND Iron Company. — During the year 1883, this com- 
pany mined the following amount of iron ore from its various mines : 
Tons. 
South Arkansas Mine 19,646 
Hot Springs Mine 25,938 
Placer Mine Ij5I2 
Total 47,106 
This ore was treated at the Company's works at Bessemer, and converted 
into the following manufactured products : 
Merchant bar-iron and mine rail . . 4,647 tons of 2,000 
Pig-iron 25,706 '* 2,000 
Casting i>378 ** 2,000 
Steel rails 16,246 " 2,240 
Muck-bar 3,184 " 2,240 
Nails 66,724 kegs of 100 
Spikes 9,841 *' 100 
The mining product of this State for the year 18S3 — gold, silver, copper, 
and lead — is estimated by the Denver Republican as follows : 
County. Amount. County. 
Boulder $400,000 La Plata . . 
Chaffee 300,000 Ouray. . . 
Custer 800,721 Park . . . 
Clear Creek 2,000,000 Pitkin. . . 
Dolores 200,000 Rio Grande 
Eagle 930,000 Routt . . . 
Fremont 20,000 Saguache . 
Gilpin 2,208,988 San Miguel. 
Grand 10,000 ■ San Juan. . 
Gunnison 650,000 Summit . . 
Hinsdale 390,000 
Lake 15,691,200 
Total production last year, $25,750,898, showing an increase this year of 
$555>233- 
Amount. 
128,688 
700,600 
400,000 
125,000 
182,000 
75,000 
100,000 
225,000 
418,954 
350,000 
Total $26,306,131 
RECENTLY PATENTED IMPROVEMENTS. 
j. c. higdon, m. e., kansas city, mo. 
Apparatus for Use in Tunneling, Mining, and Excavating Opera- 
tions. — In the construction of tunnels the usual course has been heretofore to 
first place in position the drilling mechanism, and prepare holes for the reception 
