GOLD MINING m COLORADO. 505 



of retorted amalgam, per cord, would be 450 ounces for 30 cords, which at 

 $20, currency, per ounce, would be $9,000, leaving a profit of $4,570. The 

 mine is provided with hoisting power, a small engine driving a simple wind- 

 ing spool by means of a pulley and belt. 



Product of the lode. — The total yield of the Bobtail lode since the 

 date of its discovery is said by those who have the best means of information 

 to be $2,500,000; but it has been worked by so many different parties and in 

 such an irregular manner that in the absence of reliable records it is impos- 

 sible to arrive at anything nearer than a rough estimate of the product. 



FiSKE Lode. — The Fiske lode is on Bobtail Hill, a little north of the lode 

 just described, and having such a course, as may be seen on the map, that 

 the two veins should intersect each other in the ravine, a little west of the 

 Bobtail mine. This lode is said to have been worked with encouraging results 

 in times past. All operations upon it had been suspended before the writer's 

 visit to the Territory and no convenient opportunity was afforded for examining 

 its underground developments. 



Gregory Lode. — The Gregory lode, the first discovered gold-producing 

 vein in that region which is now the center of the mining industry of Colo- 

 rado, and bearing the name of its discoverer, is, perhaps, the most widely 

 celebrated of any in the Territory. During the 10 years that have passed 

 since the commencement of work on this lode, it has been the scene of active 

 mining operations and is at present unequalled by any other in the region as 

 regards the general extent of its development; the registered locations on it 

 covering about 4,000 feet, of which nearly half is worked to a depth of about 

 500 feet. Its relation to the Bobtail lode has been already noted, and the 

 relative positions of the two veins are generally indicated on Plate XXIX. 



While the Bobtail may be looked upon as a continuation of the Mam- 

 moth, either direct or slightly displaced, the course of the Gregory diverges 

 from the latter at an angle of about 45°. Its point of divergence, if regarded 

 as a branch of the Mammoth, or of intersection, if considered as an independ- 

 ent vein, would be several hundred feet west of the little ravine which divides 

 Bobtail Hill from Gregory Hill, but its exact relations to the Mammoth are 



not definitely shown by developments thus far made, although claims have 

 64 



