Question: When did eight gold miners get attacked?
About the article "Yosemite National Park", section "Ahwahneechee and the Mariposa Wars".

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At the end of the 19th century, Cripple Creek, with a population of about 15,000, was the second-largest town in Colorado.
Along with the towns of Altman, Anaconda, Arequa, Goldfield, Elkton, Independence and Victor, Cripple Creek lay in a deep valley about 20 miles from Colorado Springs on the southwest side of Pikes Peak.
Surface gold was discovered in the area in 1891, and within three years more than 150 mines were operating there.
The Panic of 1893 caused the price of silver to crash; gold prices, however, remained high – indeed, gold was desperately needed to replenish federal reserves.
The influx of silver miners into the gold mines caused a lowering of wages.
Mine owners demanded longer hours for less pay, and assigned miners to riskier work.
In January 1894, Cripple Creek mine owners J. J. Hagerman, David Moffat and Eben Smith, who together employed one-third of the area's miners, announced a lengthening of the work-day to ten hours (from eight), with no change to the daily wage of $3.00 per day.
When workers protested, the owners agreed to employ the miners for eight hours a day – but at a wage of only $2.50.
Not long before this dispute, miners at Cripple Creek had formed the Free Coinage Union.
Once the new changes went into effect, they affiliated with the Western Federation of Miners, and became Local 19.
The union was based in Altman, and had chapters in Anaconda, Cripple Creek and Victor.
On February 1, 1894, the mine owners began implementing the 10-hour day.
Union president John Calderwood issued a notice a week later demanding that the mine owners reinstate the eight-hour day at the $3.00 wage.
When the owners did not respond, the nascent union struck on February 7.
Portland, Pikes Peak, Gold Dollar and a few smaller mines immediately agreed to the eight-hour day and remained open, but larger mines held out. 
This massacre was the result of tensions surrounding the 1987 gold rush in Brazil, with conflict between Brazilian miners and the Yanomami people.
The Yanomami tribe remained isolated until sometime in the 1960s when anthropologists found and studied the people.
Between 1973 and 1976 the Brazilians built the Perimetral Norte through the southern area of the natives’ territory.
This road initiated the arrival of gold miners, which includes those that came during a gold rush beginning in 1987.
Scholars studying the history of the gold rushes in Haximu noticed a recurring pattern of activities between the miners and the Yanomami, which Bruce Albert referred to as the “gold mining trap.” When the first few "garimpeiros" arrived, they provided the Yanomami with charitable gifts.
Once the number of miners increased, the balance of power was altered, and they began to consider the Yanomami nuisances.
Tensions arose when the Yanomami wanted more Western goods, such as medicine, clothes and food, which they had come to rely on after the miners arrived.
As a result, violence often arose between the groups.
Such a pattern may have been the reason why the miners attacked the Yanomami. 
In January 1860, the surveyor reported that "Lamplough may safely be classed amongst the permanent and payable gold fields of Victoria".
He did note that the field was overpopulated, particularly by those in business pursuits: "there appears to be nearly one place of business to each miner’s tent".
In March 1860, the surveyor reported: "Lamplough, during the last few weeks, presents the appearance of one of the settled gold fields.
The late departures to the Inglewood rush have materially improved its condition by withdrawing a portion of its surplus population, such as unsuccessful miners, storekeepers, &c. It may safely be presumed that those now remaining are all making at least a good livelihood".
In June 1860 he reported: "At Lamplough, the Deep Lead (with the exception of minor rushes in the immediate neighbourhood) offers sufficient inducements to remain.
The lead appears still to adhere (as originally) to the southern reef, neither do the workings get into deeper or wet ground.
It has been found payable more than two miles in length from the original prospectors’ claim, and three claims in width, the average yield being an ounce to the load, with one foot thickness of wash-dirt".
July 1860: "The Lamplough Deep Lead is steadily progressing.
Several other shallow workings upon adjacent hills, and many of the neighbouring gullies, are being prosecuted; but, from what I can ascertain, are only attended with wages results.
The population at Lamplough is rather on the increase, principally from Inglewood.
A new rush occurred a few days ago about eight miles from Lamplough, on the Lexton road; but in the absence of any payable ground (except the prospectors) having been discovered, it has nearly subsided again".
September 1860: "At Lamplough I cannot note any material change in mining since my last.
Several of the small rushes in the immediate vicinity appear to give remunerative employment to a large number of miners whilst water for washing purposes is easily obtained; but in the absence of any natural or artificial means for securing it in this dry part of the district, and that when the present supply is exhausted, I predict a considerable decrease in their numbers will result".
In November 1860: "Lamplough (with occasional small rushes, either to the deep lead or to the immediate vicinity) still retains its population."
In January 1861, the report was quite different: "The population at the new diggings (Mountain Creek) is yet daily increasing, and from the fact of payable ground having already been found extending over a large area, together with new discoveries of frequent occurrence, ... Lamplough, and all the other sections of my division (in consequence of this rush), are now quite denuded of their European alluvial mining population".
In March 1864, 160 alluvial miners were reported to be working at Lamplough of a total of 1,605 miners working within the Avoca Division.
This number remained fairly steady until the end of 1866 and in 1867 shrunk to 70 miners.
In 1869, a company was mining in the area. 
Coal miners in Nova Scotia were first organized by the Provincial Workmen's Association (PWA) in 1897.
The United Mine Workers of America (UMWA) attempted to organize the miners and supplant the PWA in 1908.
The two unions fought for control, but in 1917 joined forces and formed the Amalgamated Mine Workers of Nova Scotia.
The Amalgamated affiliated fully with UMWA a year later.
Miners were represented continuously by UMWA over the next 80 years.
Strikes during this period were exceedingly rare.
Nevertheless, major work stoppages occurred in 1920s.
In 1920, the British Empire Steel Corporation (BESCO) took ownership of all gold, silver and coal mines in Nova Scotia.
UMWA and BESCO had an extremely adversarial relationship.
After BESCO slashed wages by a third in 1922, 12,000 outraged union members struck.
Twelve hundred cavalry troops were sent to Cape Breton to keep order, and machine gun nests were set up to protection BESCO property.
After eight months, BESCO agreed to cut wages by only 18 percent—an agreement neither side was very happy with.
During a steelworkers' strike in the summer of 1923, mounted provincial police attacked a crowd of women and children on July 1, 1923 in what became known as Bloody Sunday.
The miners' union struck in protest.
Federal troops were called in to break both strikes.
Six months later, when the miners' contract expired, BESCO proposed wage cuts totaling 20 percent.
The union struck again, and a new contract restoring the wage cut was reached in April 1924.  
Adams, for whom the legend became known and whose first name forever has been lost to history, was journeying in his wagon from the state of New York to Tucson.
After Apaches set his wagon on fire, Adams drove a dozen saved horses towards Sacaton, Arizona, with the hope to sell them.
In Sacaton, Adams met a group of twenty one miners led by John Brewer traveling together in search of the gold fields.
The party also accounted the Pima-Mexican guide who promised the prospectors to lead them to the valley of gold :“I know a place where canyon walls cry tears of every day!
And those tears are larger than your coins!” Supposedly, In 1862, the young Pima-Mexican had gone on an expedition with the Apaches when those attacked Pueblo Indians in western New Mexico.
While on the expedition he had seen gold nuggets that were larger than oak nuts.
The young man had appreciation for works made out of silver and turquoise but had no knowledge of gold value.
The miners made a bargain with the guide who only asked for a horse, a saddle, a weapon and some of the gold in exchange.
The group was badly in need of horses, and when by fate Adams appeared in Sacaton with his twelve head, Brewer struck a deal with Adams on the terms that Adams would share leadership with him in exchange for donating his horses.
Along with their guide the group followed White River and its east fork into the White Mountains and entered western New Mexico.
The guide paused and pointed to two mountains that were shaped like sugar loaves.
“The gold canyon lies at the foot of those peaks,” the guide said.
According to Adams, from that mountain lookout the miners were able to observe San Francisco Mountains.
Adams thought that this mountain range was located on Mt.
Ord, or on one of the mountaintops nearby.
The miners entered a canyon with a fantastic gold deposit through 'the Little Door', as Adams referred to it.
He said that the passageway was so narrow that the riders had to enter it one by one.
Within a few days the group collected a fortune of gold nuggets that they hid in a corn-grinding basin left by ancient Indians.
The young guide left the miners on the second night after the discovery and after being paid.
Before leaving the guide issued a warning.
He told the group not to stay long in the canyon that was a campsite for Apaches.
The miners continued to mine the gold until they ran out of supplies.
The party decided to send Brewer and five others to buy more supplies at Old Fort Wingate, west of modern Grants.
Nine days after the provisions party did not return, Adams became concerned about their safety.
Along with another miner named Davidson, Adams climbed out of the canyon to discover five bodies on the trail, Brewer was not among them.
They raced back towards camp, but it was too late.
A large party of Indians had reached the camp and killed the remaining miners.
Days later, Adams was found by a military patrol wandering in the wilderness and out of his mind.
Upon recovery Adams settled in California and when the Apache Wars ended, he led several expeditions to find the canyon and the basin filled with gold.
Adams must have had a terrible sense of direction, after so many years of searching his quest proved hopeless.
But in his search he inspired others to joint the hunt.