Cresson Mine: The untold stories

Benjamin Hayden Elick and Steven Wade Veatch (USA)

The Cresson mine (Fig. 1) – situated between Cripple Creek and Victor in Colorado – was established in 1894 (MacKell, 2003). No one is certain who started the mine, but records show that two brothers, insurance agents, J R and Eugene Harbeck from Chicago, were early owners. After a hard night of drinking, they sobered up the next day and learned of their new acquisition (MacKell, 2003). The Cresson Mining and Milling Company was organised a year later, in 1895, to raise capital and operate the mine (Patton and Wolf, 1915). The mine continued operating through several leases with low but steady proceeds.

The Cresson mine became profitable when Richard Roelofs, a known mining innovator, was hired by the Harbecks as mine manager in 1895. Roelofs wrote in an undated letterhead:

I was a prospector, a leaser, a miner, an assayer and chemist, an underground shift boss, foreman, superintendent and then general manager of one to the greatest of Colorado’s mines” (Roelofs, n.d.).

Roelofs (Fig. 2) was a newcomer to Colorado, as many were when the Cripple Creek gold rush ignited in 1891. He moved to Cripple Creek in 1893 with his wife Mabel. They had one child, Richard Jr, who was born on 19 August 1894 in Cripple Creek.

Not only did Roelofs have to manage the Cresson mine, he had to raise his son alone. Shortly after the birth of Richard Jr, Mabel left her husband and went to Philadelphia, taking their infant son with her. She left Cripple Creek to pursue riches. Then, in July 1895, police arrested her for passing bad checks (Keels, 2018). Richard Jr was sent back to Cripple Creek to join his father. Mabel Roelofs later fled to New York, where she continued a life of crime working con after con. As authorities began to close in, she committed suicide by poisoning in 1908 (Keels, 2018). Richard Roelofs, in his employment contract, earned a percentage of the Cresson mine’s profits, making him a very rich man. If Mabel Roelofs had stayed with Richard, she would have shared in his fabulous wealth.

Roelofs introduced new technology and mining techniques at the Cresson mine, including an aerial tramway he designed that transported ore to a railway at the bottom of the large hill on which the Cresson sat. The tramway reduced the costs of transporting ore (Sprague, 1953). Roelofs deepened the shaft and enlarged the mined-out voids, or stopes. The Cresson’s stopes were the largest in the district, at almost 100m in width and hundreds of meters high. It is estimated that several houses could fit inside these stopes (Jensen, 2003; Sprague, 1953). Roelofs’s work allowed the Cresson mine to be debt free by 1911 and it earned $150,000 annually between 1912 and 1913.

Miners discovered the famous Cresson vug by accident on 25 November 1914 (Smith Jr, Feitz, and Raines, 1985). While following large ore shoots on the 12th level, miners broke into the large chamber, or ‘vug’, which was in the shape of a pear (Patton and Wolf, 1915). The vug was approximately 12m tall, 7m long and 4m wide. The walls were lined with delicate, sparkling crystals of gold tellurides; however, many had fallen to the floor – disturbed by nearby blasting (Jensen, 2003).

The ore minerals in the vug were mostly the gold tellurides, sylvanite and calaverite. Sylvanite is comprised of gold, silver and tellurium, while calaverite contains only gold and tellurium. The tellurides within the Cresson vug occurred as crystals, varying in length from 1mm to 3mm. On some crystals of calaverite, pure gold was found, suggesting chemical alteration (Patton and Wolf, 1915). These ore minerals penetrated beyond the surface of the vug into the surrounding rock to depths of up to 1.5m (Mehls and Mehls, 2001).

The gold camp was soon buzzing with conversation about the vug, and word of the discovery spread across the nation. National newspapers said the vug “staggers the imagination”, and another paper declared it “the most important strike ever made in the Cripple Creek District” (Various period newspapers: Cripple Creek District Museum, n.d.). This astonishing discovery supported Cripple Creek’s claim that it was the “World’s Greatest Gold Camp”.

The vug, and a considerable amount of Cresson ore, was a part of the Cresson pipe, or blowout. The Cresson pipe is an elliptical cylinder of lamprophyric material (mafic rocks) 100m to 150m in diameter (Jensen, 2003). The lamprophyric matrix graded into a lighter coloured carbonate matrix (Jensen, 2003). The entire blowout is encased inside a diatreme, a carrot-shaped volcanic complex, emplaced in the Oligocene (about 30 Ma) that reached deep into the crust (Jensen, 2003). The perimeter of the pipe produced 2,000,000 ounces of gold, indicating major deposits of gold-bearing solutions along the contact between the Cresson pipe and the diatreme (Jensen, 2003).

The gold ore from the vug was so valuable that Roelofs quickly took measures to prevent theft or high grading (that is, the concealment and theft of valuable gold ore by miners for personal profit). He ordered a storehouse built underground (on the same level as the Cresson vug) into an old drift and secured it with solid steel doors. Bags of gold ore were stacked by hand and securely locked inside. A newspaper article described the magnitude of ore as “they had stacked between 80 to 100 tons of the phenomenally rich ore at the time of my visit, and from all indications, will continue stacking this ore for some time” (Various period newspapers: Cripple Creek District Museum, n.d.). At times, up to $500,000 (1914 value, or $36,250,000 in today’s dollars) worth of gold ore was stored there.

The Cresson vug’s valuable gold ore also needed special handling. Roelofs hired guards to protect both the vug and ore. The guards watched over the ore on every part of its journey through mining, transportation, and processing – keeping it safe from thieves. Two to three armed guards worked each shift underground, providing constant protection to the ore and vug. To prevent high grading, Roelofs allowedonly two of the most trusted and senior miners to work the vug at a time, and always under close supervision.

The Cresson mine took precautions to secure the ore while it travelled on the railways to smelters. These measures included locked box cars and guards carrying sawed-off shotguns and rifles, who rode inside and on the top of the cars (Newton, 1928). Accounts claim that gold ore was scraped off the vug’s walls and then shovelled into large canvas bags (Fig. 3). It took four weeks to mine the vug out (Cunningham, 2000).

There were two main grades of ore from the Cresson vug: the first grade included ore worth over $5,000 (1914 dollars) a ton and the second grade from $1,000 to $1,500 (1914 dollars) a ton (“$10,000,000 Strike in Cresson Mine Proves Again that Colorado is the Paradise for the Gold Hunter“, 1914, p. 5). The higher-grade ore had 250-plus ounces of gold a ton, while the second grade of ore had 75-plus ounces a ton, based on the 1914 gold price of $20 per ounce (Historical Gold Prices, 2015).

In all, a whopping 60,000 ounces of gold was recovered from the vug (Hunter, 2002). The total value of the vug’s ore in 1914 gold prices was $1,200,000 (Smith Jr, Feitz and Raines, 1985). Based on today’s gold values, the vug’s rich ore would be worth over $87,000,000.

The discovery of the Cresson vug prompted other mines in the district to deepen their shafts, since the vug was found on a deep level of the Cresson. Mine owners also expanded exploration in their mines.

Roelofs, at the age of 50, sold out in 1917 and spent the next 30 years comfortably in New York while spending time abroad, mostly in Paris. Richard died at the age of 82 in 1939 (Sprague 1953).

The Cresson mine was operated for 66 years, finally closing in 1961 (Munn, 1984). After finishing as one of the top producing mines in the district, its buildings were torn down and the head frame and its machinery were moved to a park in Victor.

In the early 1990s, exploration geologists discovered a 2.5 million-ounce gold deposit in the same area as the historic Cresson mine, called the Cresson deposit. The Cripple Creek and Victor Gold Mining Company submitted permit applications in 1994 for open pit mining of the Cresson deposit and surrounding areas. Mining started in December 1994 and, by the end of 1995, 76,500 ounces of gold were produced. The Cripple Creek and Victor Gold Mining Company is still mining the area today under the ownership of Newmont Goldcorp, with headquarters in Greenwood Village, Colorado.

The original Cresson mine shaft is long gone and, in its place, is the Cresson open pit at 518m deep (Poulson, personal communication, 2019). Newmont will deepen the pit another 91m for an ultimate depth of 609m. At this point, a portal for underground exploration is planned at the bottom of the pit. This project is planned in two phases. In phase one, a decline drift is planned with 762m of easterly exploratory drifting underneath the Cresson pit. The intention is to establish drill bays at the end of the drift for core drilling below the historic Orpha May and Vindicator mines. The estimated cost of this phase is $26 million. Phase two includes 3,048m of exploration drifting and positioning core drilling bays at an additional $100 million cost. The goal is to prove the potential for underground mining projects. If Newmont Goldcorp’s investment council approves this plan, the project will start as early as the first quarter of 2020 (Poulson, personal communication, 2019).

The Cresson mine took its place among the important mines in Cripple Creek as a result of its early establishment in the district, an innovative mine manager, expansive underground workings, and the discovery of the rich Cresson vug. Mining continues at the Cresson today.

References

$10,000,000 Strike in Cresson Mine Proves Again that Colorado is the Paradise for the Gold Hunter. (1914, December 30). Denver Post, p. 5.

Cunningham, C. (2000). Cripple Creek Bonanza: From Gold to Gambling. Ridgway, CO: Wayfinder Press.

Historical Gold Prices. (2015). Retrieved from Only Gold: http://onlygold.com/Info/Historical-Gold-Prices.asp

Hunter, E. T. (2002). A Thumbnail Sketch of the Cripple Creek/Victor Mining District’s History. Manuscript on Newmont Gold Corp website: https://www.newmontgoldcorp.com/wp-content/uploads/2019/04/ccv_history.pdf

Jensen, E. P. (2003). Magmatic and Hydrothermal Evolution of the Cripple Creek Gold Deposit, Colorado, and Comparisons with Regional and Global Magmatic-Hydrothermal Systems Associated with Alkaline Magmatism. PhD Thesis. Departement of Geosciences, University of Arizona.

MacKell, J. (2003). Cripple Creek District: Last of Colorado’s Gold Booms. Charleston: Arcadia Publishing.

Mehls, S. F., and Mehls, C. D. (2001). Goin’ Up to Cripple Creek: A History of the Gold Belt Byway. Lafayette, CO: Western Historical Studies.

Munn, B. (1984). A Guide to the Mines of the Cripple Creek District. Colorado Springs: Century One Press.

Newton, H. J. (1928). Yellow Gold of Cripple Creek: Romances and Anecdotes of the Mines, Mining Men, and Mining Fortunes. Denver: Nelson Publishing Company.

Patton, H. B., and Wolf, H. J. (1915). Preliminary report on the Cresson gold strike at Cripple Creek, Colorado. Golden: Colorado School of Mines Quarterly. Vol 9, No. 4, p. 199-217.

Poulson, B. (2019, Febuary). Cripple Creek and Victor Gold Mine . (S. Veatch, Interviewer.)

Roelofs, R. (n.d.). Undated letter, Cripple Creek District Musuem. Retrieved 2018.

Smith Jr., A. E., Feitz, L., and Raines, E. (1985). The Cresson Vug Cripple Creek. The Mineralogical Record, Volume 16, p 231-238.

Sprague, M. (1953). Money Mountain: The Story of Cripple Creek Gold. Lincoln: University of Nebraska Press.

Various period newspapers: Cripple Creek District Museum, n.d. (n.d.).