1. There was a real person named Jacob Waltz who had rich gold ore and lived in Phoenix. -> Yes absolutely, shows in several censuses over the years.
2. Toward the end of his life Jacob Waltz lived with Julia Thomas. -> Yes, after the famous flood of 1891 made his own home unlivable, however there is some debate whether he lived with Julia in her home or in the spare room at her shop. Personally think it was the shop not her home.
3. Dick Holmes and another man were with Jacob Waltz when he died. This is pretty well documented, the other man being Gideon Roberts.
4. When he died he left almost 50lbs of very rich gold ore. -> Dick Holmes stated there was some 44 or 48 pounds in a candle box under the death bed. That Holmes had the ore assayed and sold it to finance his search is documented, and he had some pieces made into jewelry which still exists.
5. Some of that gold ore was made into a match box which someone in Arizona still has. -> Definitely yes.
6. To this day no one has produced gold ore from a mine that matches the ore in the matchbox. ->Personal opinion, one person was SAID to have ore "identical" to that of Jacob Waltz, Walt Gassler. Gassler's son showed it to Tom Kollenborn, whom stated it looked identical, but then years later did not recall saying that. If you can find the old video of Unsolved Mysteries you can see him stating that fact.
Now, is it a fact that the gold ore came from the Superstition Mountains? -> A proven fact, no. However Waltz made a number of trips in the years between 1868 and 1891, and was trailed or attempted to be trailed a number of times. Usually he was able to lose his pursuers in the area around Weavers Needle. Dick Holmes had a different encounter and trailed Waltz to Tortilla Creek where he found Waltz sitting on a rock with a shotgun aimed at Holmes. He did not attempt to trail Waltz again.
Is it a fact that the gold ore came from a mine? -> We can not know for a certainty that the gold ore came from Jacob Waltz's mine because none of us were there. However it is a fact that gold ore always, always has to come from a mine in the first place, whether it was Waltz's mine or a Peralta mine or the infamous Easter Bunny mine. You can not 'make' gold ore, or if you could it would be too difficult to get it right and not worth the cost and effort to do it. So Jacob Waltz's ore very definitely came from a gold mine - SOMEWHERE. More on this point in a bit.
Is it a fact that Jacob Waltz tried to tell others where his mine was? -> According to Julia, Reiney Petrasch and Dick Holmes, indeed Waltz DID try to tell his friends how to find the mine, and the one remaining cache of ore he had not recovered before his demise. More on this in a moment.
Is it a fact that Jacob Waltz even wanted anyone else to find his mine? -> Again we can not KNOW what was in Waltz's mind when he was explaining to his friends how to find the mine. Perhaps he was pulling the greatest mean hoax of all time on the people whom had treated him good in his final days, we just can't know what was in his mind. Which brings me to the point I keep saying will get to in a moment.
Jacob Waltz was a Deutschman, pronounced "doy-tch-man" or German, and to Americans that means "Dutch" man and was born in Germany so certainly spoke German. In his waning years he was known to sell eggs and apparently chickens occasionally as well, and would stop at Julia Thomas's bakery to chat where he found Julia and her adopted son Reiney Petrasch also fluent German speakers. It would have been comforting for an old man with no family living around the area. Holmes is a different story, but Waltz knew Holmes as a tracker and from years spent in the wilderness, so not the same kind of friendship but yet could still be quite close friends.
Waltz pointed to the Superstition mountains and told his friends Julia and Reiney that the mine was there. Prior to his death and after repeated attempts to tell them how to find it, he supposedly made one trip with them both to try to show them exactly where it was. They took a wagon and reached the Verde river crossing the first night. Waltz told them they would be at the mine the next day. He told them to wear their old clothes because it was "very brushy" where the mine is located, but he did not tell them to bring climbing ropes and mountaineering gear. This is an important point for so many Dutch hunters have been clambering up the steepest, highest peaks in the Superstition mountain range, even rappelling down cliffs in the search for the lost mine, but it is totally illogical to look in such places because Waltz did not tell his friends to bring any kind of special gear or equipment, just old clothes that it would not matter if they got ripped up and wrecked in passing through the brush. Plus we have the alleged statement made in a saloon by a younger Waltz that you could "drive an Army pack train over my mine and never see it" which would be impossible if the mine were located on some thousand foot high cliff. The fact that Waltz in his 60s,70s etc was able to travel there and back should also tell us that the terrain is not extremely rough ground.
The Holmes version is slightly different in the way it got passed, for the logic is that Waltz realized that Julia and Reiney would never be able to find the mine, that only someone experienced in the wilderness like Dick Holmes would ever have a chance; that he had already helped Julia and Reiney enough by giving her the money from his personal gold stash to save her business (this is also documented to a degree) and that Holmes was to "do right" by Waltz's sister and Julia as well when he found the mine and cache.
The interesting thing is that Julia started her own 'queer quest' by going to the first canyon on the south side from the west end of the Superstitions, while Holmes raced to Hidden Water and then Tortilla creek, where he had personally trailed Waltz before getting caught at it. Based on their two different approaches, it is apparent that the mine can be reached either from the south or the north. Julia went via the north route on her second attempt, literally passing over the rich gold veins of what became the Goldfield district without knowing it.
The problems begin with these folks, whom of all the people who ever searched for the Lost Dutchman mine, SHOULD have found it, since they had the info directly from Waltz himself. Yet none of them were able to find it.
Unfortunately since Waltz's death and the publication of the story, several other lost mine tales have become interwoven and mixed into the original story, giving us now over 100 different clues, for an impossible gold mine that has an opening "no larger than a barrel" and is a "huge open pit with steps going down" etc. It is gold in white quartz, rose quartz, black quartz, green quartz, rusty quartz and probably several other colors by now as well. Worse, even though we might try to filter out only the info from Holmes and Julia, Holmes went to Julia and they had an in depth comparison of notes right after she had given up on her own quest. So the flawed and unrelated info from other lost mines almost certainly has been getting mixed up from the very beginning!
Sorry for the long winded post there, I am sure many others have very different opinions on these issues. Please do continue.