Cassiterite - well, big ask there - it's not common at all, and one of the things you'd have to order rather than fossick for. I've panned cassiterite before - it occasionally turns up among our heavy mineral samples, etc.
Actually, what I'd do is cheat, and use high-tin pewters as a source for tin. Mind you, they often have a bunch of unwanted crap in them these days.
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Actually, what I'd do is cheat, and use high-tin pewters as a source for tin. Mind you, they often have a bunch of unwanted crap in them these days.