By 1872, he was living in Vienna and was employed by the Department of Justice as an officer and by Prince Rudolf's family as his tutor.

By 1872, some 40, 000 rickshaws were operating in Tokyo.

By 1872 Jacob Samuels, William Jesse Boaz, and William Henry Davis had opened general stores.

By 1872 Chinese workers comprised half of all factory workers in San Francisco and were paid wages far below white workers.

By 1872, when the gold rush in Elizabethtown had died down, the county seat was moved to Cimarron.

By the time Nashville was incorporated in 1872, water powered grist mills and sawmills were scattered over the county.

By 1872 a Spanish American agricultural community had developed.

By 1872, there were eight thousand acres ( 32 km² ) of land under cultivation in the valley and a thriving community had been built along the Salt River.

By 1872, the line was completed, together with a " spur " to Washington DC and the entire line through Southern Maryland was completed in 1873.

By January 1872, more than half of the work had been completed on the roadbed, but the railroad had to apply for an extension from the Board of Control because it had not completed track laying on the first.

By the end of summer in 1872, eighty-five buildings had been constructed where just one year before there had been nothing but a field of prairie grass.

By 1872 the Missouri, Kansas and Texas Railway ( MK & T ) began building tracks through the area.

By 1872, a stop on the Portland-St. Joseph line in Patton Valley was officially named Gaston.

By 1872, the shaft was deep and 130 men were working in the Lance and Cooper veins.

By 1872, the shaft was deep reaching the Lawler and Wilkman coal veins.

By 1872, a contractor, T. C.

By the end of 1872 the telegraph had been extended through Monroe, which connected it with the rest of Utah.

By 1872 75-100 tons of coal per day were being produced at Newcastle.

By 1872 he had completed his monumental fourth opera, Libuše, his most ambitious work to date, but was withholding its premiere for the future opening of the National Theatre.

By 1872 the University had already begun to confer undergraduate degrees, with master's degrees coming in 1875 and doctoral degrees in 1888.

By 1872 Lord Kelvin devised an analogue computer to predict the tides, and by 1875 Frank Stephen Baldwin was granted the first US patent for a practical calculating machine that performs four arithmetic functions.

By 1872, he had lost interest in Mathilde, and effectively abandoned her and their son, preferring the company of his new lover.

By 1869, the croissant was well established enough to be mentioned as a breakfast staple, and in 1872, Charles Dickens wrote ( in his periodical " All the Year Round ") of: the workman's pain de ménage and the soldier's pain de munition, to the dainty croissant on the boudoir table

By 1864 – 1872, he was a member of the firm of Dabney, Morgan, and Company.

By 1895, Leadville mines posted their largest combined output since 1889, and Leadville was then Colorado's most productive mine camp, producing almost 9. 5 million ounces of silver.

By 1856, the average depth in the area west of Mons was 361, and in 1866, 437 meters and some pits had reached down 700 and 900 meters ; one was 1, 065 meters deep, probably the deepest coal mine in Europe at this time.

By the early 1990s, the combined Rio Grande / Southern Pacific Railroad had lost much of the competitive advantage that made it attractive to transcontinental shippers, and became largely dependent on hauling the high-quality coal produced in the mine fields of Colorado and Utah.

By 1933, the mine was producing substantial quantities of mercury.

By 1893, the Santa Fe Railroad passed within three miles of the mine, at Congress Junction.

By 1932 the price of copper had sunk to 5 cents per pound, and the United Verde closed until 1935, when Phelps Dodge bought the mine for $ 21 million.

By 1932 the Central Eureka mine, begun in 1869, had reached the level.

By 1939, it was the best-paying mine in Sutter Creek.

By 1890 this location was taken over by the PIKE mine.

By 1868, both iron and zinc operations were in progress at Sterling Hill, but the numerous companies and claims were embroiled in continuous legal battles, the largest of which was a 12-year dispute between the New Jersey Zinc Company and the Franklin Iron Company over rights to mixed ores, each company having purchased the right to mine zinc and iron, respectively.

By 1895, he employed six men, and sold the mine to the Fort Smith and Western Coal and Railway in the following year.

By 1830, probably inspired by his neighbor Freeman Thomas's Grand Tunnel coal mine, Harvey supplemented his farm income by constructing a coal tunnel.

By 1914, the mine had reverted to the Lehigh & Wilkes-Barre Coal Co. which operated a washery and breaker.

By April 6, the last of the bodies was taken out of the mine, that of the foreman, Thomas Picton.

By this time, the mine was largely depleted, but in December 1940, the Sunday Independent reported that " the old Gaylord mine, now being operated by Samuel Bird, brother of Morgan Bird, is showing signs of being able to absorb additional number of men in the future ... Lance prepares the coal.

By 1870, J. C. Fuller operated the mine, and in 1871, the Northern Coal & Iron Co., a subsidiary of the Delaware & Hudson Canal Co., assumed operation of the mine.

" By 1916, the D & H decided to abandon the No. 3 breaker and run coal from the mine through the company's No. 5 breaker, but on the morning of December 2, the No. 3 breaker was totally destroyed by fire.

By 1914, the mine was sold to the Union Coal and Coke Company and later to Bethlehem Steel which continued to extract coal until 1988, when the main conveyor caught fire.

By 1900, the mine employed 271 people.

By 1921, Monongahela Traction had opened a second mine in the area near Baxter, about a mile up Paw Paw creek.

By 1880 Cooke had met all his financial obligations, and through an investment in a silver mine in Utah, had again become wealthy.

By 1999, there were more than 250, 000 mine shaft entrances in the area and a law discouraged large-scale mining by allowing each prospector a claim.