Bottom Line First: I reviewed your posted family tree first. It REALLY helps volunteers to see your tree to determine what information you have already.http://trees.ancestry.com/tree/13932421/person/21125437
The John McKane on your tree (death certificate) appears to be a person that had just arrived in New York on the Lusitania just two months before, and appears to have left his wife in Scotland. Unless you have documentation that identifies this person to be someone that mined gold with a Mr. Schwabb, there doesn't seem to be a connection. It might help for you to identify what data you do have on your John McKane. This person does not appear to have a connection to your Margaret McKane, except for both being born in Scotland.
From your posted Death Certificate: John McKane.
Date of Birth, Nov 25, 1861,
Informant: G.A. Willard, 615 Grand Ave, Oakland
Mount View, Cemetery, Oakland
James Taylor & Co, 15th & Jefferson St, Oakland.
In CA: 10 Days, in US 2 Mos.
Age 48 years, 6 months, 2 Days.
Informant: G.A. Willard, 615 Grand Ave, Oakland.
The 1910 Census for Oakland, Alameda County, CA, living at 615 Grand Ave.
George A. Willard, age 71, born in Canada to both parents born in Maine, employed in Real Estate. Married 46 years.
Charity J, wife, age 64, born in Canada, immigrated in 1859 (Naturalization status not shown. In 1910, the wife was considered to have the citizenship of the husband. That changed in 1922). She was mother of 7/6 living.
They had a 20 year old Japanese servant, George Kosuda.
--This is probably the informant on the death certificate for the John McKane identified. Do you know of a connection to this person, or to his wife, Charity, with either your John or Margaret McKane.
Burial in the Mountain View Cemetery, Oakland:http://files.usgwarchives.net/ca/alameda/cemeteries/mtvview-...
shows born 11/25/1863[sic], died 6/15/1911, born in "Dunfermline, Scotland." Plot number 33.
--This would be a lead to contact this cemetery to see what, if any, records they may have. There "might" be information concerning John, a burial permit, possibly other data. The owner/purchaser of the grave site would be information that might lead to other information.
--Your tree identifies his birth as 11/25/1862, the Death Certificate 11/25/1861, this record 11/25/1863. Your date of death shows 16 June 1910, this record shows 15 June 1911.
The Canadian Census of 1901 for: Subdistrict of: Kootenay (West/Ouest) (Rossland Riding/division Rossland); District of Yale & Cariboo, British Columbia, Canada:http://automatedgenealogy.com/census/View.jsp?id=61843&h...
shows a John McKane, born Feb 1860, age 41.
--Your information on your family tree shows this person as age 39. This person by the census does not appear to be the same person as being researched as being on that death certificate.
The New York Passenger Lists 1820 to 1957
--This person was aboard the Lusitania, sailing from Liverpool on 11 March 1911, arrival 17 March 1911 (Which would be about two months in the US if this was the person whose death certificate was identified).
John McKane, age 50 (1861), Race: Scotch, Last Permanent Residence: Scotland, Edinburgh. Name and Address of Nearest Relative: Wife, Mrs. McKain, Caledonian(?) Hotel, Edinburgh. Final Destination: New York. Whether ever before in the US: Yes, 1907 Place of Birth: Scotland, Dunfermline.
England Outbound Passengers:
J. McKane, year of birth: Unknown, departed 1906 form Liverpool, destination: Canada, Montreal. This is from a pay site.
Canadian Passenger lists for 1906 with arrival at Montreal, departure of Liverpool identified 71 arrivals, each with their own passenger lists:http://www.collectionscanada.gc.ca/databases/passenger/00104...