South Australian police are seeking the extradition of a man arrested in Cobar on Monday after an alleged home break-in over 1000 kilometres away in Yorketown.

Police say they were called to the SA property early Monday morning after three men allegedly broke in and assaulted a 74-year-old occupant.

The men allegedly stole a "large amount" of cash, a "large quantity" of collectable coins and "a number" of firearms.

Police say they also stole the man's Toyota sedan, which was later found in Minlaton, about 30 kilometres from Yorketown.

"(The victim) sustained injuries to his head and was treated at the local hospital," a police spokesperson said.

At about 8.45am the same day, police patrols stopped a white Hyundai van on the Barrier Highway near Broken Hill.

 The distance from Yorketown to Cobar. IMAGE: Google Maps

A passenger ran from them while a 49-year-old driver was arrested.

Police searched the van and found firearms, collectable coins and cash stolen from the Yorketown property.

"Later that day at about 3pm, patrols stopped a white van on the outskirts of Cobar, which police suspected had been travelling with the first van," a police spokesperson said.

"Police searched the van and located further items stolen from the Yorketown break-in."

Firearms police say they recovered from the alleged break-in. SOURCE: NSW Police.

A 35-year-old man was arrested and charged with knowingly dealing with proceeds of crime and receiving property stolen outside of NSW. He was refused police bail to appear in Cobar Local Court yesterday.

The 49-year-old NSW man was charged with offences including knowingly dealing with proceeds of a crime, receiving property stolen outside NSW and possessing a loaded firearm in a public place.

He was also refused police bail and appeared in court yesterday.

Police applied for the extradition of the two men at their court appearance.