"FIGHTING TO THE DEATH"
Found this article in the St. Louis Globe Democrat, published Saturday, April 10, 1875, page 2.

A short overview:

Based on the 1870 census for Emmetsburg, Deer Lodge, Montana Federal Census, David Cartwright, b. ca. 1832 England, was a miner; while Mathew Wallwork, b. ca. 1841, Pennsylvania or Tennessee, was a saloon keeper. The handwriting in the 1870 census of the birth place “Tenn”, was indexed alternately as Tennessee and Pennsylvania, leading to a bit of confusion, as to the birth place of Mathew.

Based on the book, “Montana Pay Dirt” a guide to the Mining Camps of the Treasure State, by Muriel Sibell Wolle, published 1963, by Sage Books, Denver, Colorado- the ghost mining town of Emmetsburg was located between the mining towns of Black Pine and Sunrise, on Henderson Mountain.

In 1870, 130 residents were enumerated in 55 dwellings; while 26 dwellings were listed as empty or no-one present at the time the census taker visited the site. There were 7 families, and numerous sets of men with the same last name-presumably brothers/relatives. 95 occupants were primarily men, single, between the ages of 25-50, of which 70 were miners. The miners came from Ireland, Canada (New Brunswick), Baden, Norway, Denmark, Scotland, Illinois, Iowa, New York, and Ohio. There were 14 females and 116 men. Occupations: Blacksmiths: William McDonald of England & Jacob Baker of Prussia; Farmers: Alexander White of Iowa; Henry A. Powell, Milton Chaffin, and John W. Humble all of Missouri; John Pickens of England, and William McFarland of Ireland. Dairyman, John C. Hubbard of Indiana; Rancher Augustus K. Gid (Kid?) of Ohio; Grocers: John Caplice of Ireland, Thomas Smith of Missouri, Donald Muchison of Scotland, and James Davidson, of Canada. One Boarding house managed by John O’Conner of Ireland; while Saloon Keepers included Julian Abfite of France and wife Mary Abfite of Denmark, Mathew Wallwork of PA or TN; James Obrien of New York, and Joseph Lewis of England. Henry Nerling of Baden operated a Mill Ranch. One domestic servant, named Rose Cupin, 18, worked in the household of Charles M & Martha Douglas of Illinois. Several households listed no occupation.

And now for the story:

"FIGHTING TO THE DEATH"
A Duel Between Partners in Montana-Game to the Last
(From the Montana Northwest)

Cartwright and Wallwork were partners in a prospecting enterprise near Emmetsburg, and had been working together for some time. They had at one time had differences, but they had been amicably adjusted. Ferguson was the friend of both, esteemed by both, and is Justice of the Peace of the township.
On Monday last, (March 29th or April 5th) Wallwork, Ferguson and Charles Cooper had just returned from Phillipsburg, and Wallwork and Cartwright happened to be in Ferguson’s cabin about noon. Only the three men were present. Wallwork and Cartwright drifted into a quick quarrel (something about the prospecting claim, we learn), and both drew weapons simultaneously-Wallwork a derringer and Cartwright a navy revolver. Ferguson interposed to prevent an affray, and caught the revolver, which was accidentally discharged in the scuttle, the ball passing through Ferguson’s right hand, between the first and second fingers, breaking the bone of the first, but not severing the tension. The ball lodged in the floor of the cabin.
All three left the cabin, Ferguson going into Caplice & Smith’s store to have his hand dressed. While the hand was being dressed, Wallwork and Cartwright came together again in the street. Frederick Grant was the only witness of the first part of the second encounter. He says they were standing about five or six feet apart, each armed as before. Cartwright said to Wallwork two or three times: “I’ll riddle you for that” – presumably having reference to the accidental shooting of Ferguson, or the remarks made in the cabin.
Wallwork, responded, “Commence,” or words to that effect and fired his derringer; Cartwright fired his navy about the same time. Some say the firing was simultaneous; others that Wallwork fired first. Wallwork’s derringer had entered about one inch below the outer of Cartwright’s breast. He fell, raised on his knees, and fired two more shots, and fell over on his side with a moan. Wallwork, who had received in front every ball fired from the navy, turned to walk away, and again turned back, when Cartwright raised a little and fired a fourth shot, that also striking Wallwork.
One barrel remained loaded, six shots fired had each hit a man. Wallwork received one ball which lodged three inches above the right knee; one passed into and through the upper part of the right leg from the side, and two balls entered the left leg from the front, one fracturing the femoral artery, (which will probably prove fatal), and one entering four inches below and to the left. Cartwright died. Wallwork has little chance of recovery. Both men were well thought of; were sober, and given to desperate deeds, and had been friendly. But both were game. Wallwork was a large, powerful man; Cartwright a small man.