I am going hunting for iron ore in Switzerland and the plan is to visit some old abandoned mines in the Jura mountains. I am not quite sure exactly what I am looking for though, in the past I have found a lot of magnetite in other countries, but I do not think that is present here.
In a report by the USGS I found the following passage:
Jura Mountains -- In the Jura Mountains of western Switzerland are found the so-called "Bohnerze" -- pisolitic ores derived from Mesozoic iron-bearing limestones by superficial disintegration during the Eocene epoch. They are low-grade, slightly titaniferous ores which contain 42 per cent of iron after washing.
What does this kind of "Bohnerze" ore actually look like, and how would I best find it? Will the ore be magnetic?