464 GEOLOGY AND MINING INDUSTRY OF LEADVILLE. 



New Discovery No. 1 shaft is that in which the original discovery of 

 ore was made on the claim by George Fryer, at a depth of 60 feet. The 

 iron body was onl}- 20 feet thick, and this shaft then passed into the under- 

 lying White Porphyry. The small thickness of the iron body is here due to 

 the fact that the upper portion of the ore horizon has been eroded off. In 

 later times considerable exploration has been done from the shaft to deter- 

 mine whether the ground to the south is ore-bearing or not. Diamond-drill 

 borings were made from an east drift at a depth of 165 feet below the top 

 of the shaft, both eastward in a horizontal direction and vertically down- 

 wards. Neither found any ore bodies. The vertical drill penetrated to a 

 depth of over one hundred and seventy -five feet, making a distance of 340 

 feet in all below the surface. It passed through the porphyry, finding a 

 thin streak of iron vein material in its midst, into the Silurian formation, 

 and apparently through that into the Lower Quartzite or Cambrian. Fre- 

 quent assays of the cores were made by Mr. Rildolph Keck, and a slight 

 trace of silver, amounting in some cases to ten ounces to tht) ton, was found 

 in most of the material passed through, but no evidence of any ore bodies. 



To the southward a drift was run, descending from 10,347 to 10,316 

 feet elevation, which passed through White and Gray Porphyries, finding a 

 small streak of iron oxide at the contact of the two. In the Gray Porj^hyry 

 body the drift turns abruptly east to connect with No. 5 shaft, which it 

 does at 100 feet below the surface. This shaft was sunk to a depth of 185 

 feet, and, judging from the material on the dump, must have passed through 

 tlie Gray and White Porphyry bodies and the Parting Quartzite into the 

 White Limestone 



An exploring shaft (No. 6) was also sunk on the ridge south of Little 

 Stray Horse gulch, at the southern extremity of the claim. It was driven 

 somewhat intermittently, and could not therefore be closely followed. The 

 rocks passed through were approximately as follows: Wash, 120 feet; Gray 

 Porphyry, 40 feet; Blue Limestone, 60 feet; Parting Quartzite, 20 feet; 

 White Limestone, 20 feet. This is on the south side of the shallow anti- 

 cline assumed to exist under Little Stra}- Horse gulch. The structure, as 

 Avell as could be deduced from the meager data obtainable in this part of 

 the region, is shown on Sections C and K. The body of Gray Porphyry, 



