I have melted small amounts of bronze in a crucible with a large propane torch (much larger than the plumbers torch, but it can be run of those propane cylinders you can buy for a gas grill).
1	I	I	PRON	PRP	Case=Nom|Number=Sing|Person=1|PronType=Prs	3	nsubj	3:nsubj	_
2	have	have	AUX	VBP	Mood=Ind|Number=Sing|Person=1|Tense=Pres|VerbForm=Fin	3	aux	3:aux	_
3	melted	melt	VERB	VBN	Tense=Past|VerbForm=Part	0	root	0:root	_
4	small	small	ADJ	JJ	Degree=Pos	5	amod	5:amod	_
5	amounts	amount	NOUN	NNS	Number=Plur	3	obj	3:obj	_
6	of	of	ADP	IN	_	7	case	7:case	_
7	bronze	bronze	NOUN	NN	Number=Sing	5	nmod	5:nmod:of	_
8	in	in	ADP	IN	_	10	case	10:case	_
9	a	a	DET	DT	Definite=Ind|PronType=Art	10	det	10:det	_
10	crucible	crucible	NOUN	NN	Number=Sing	3	obl	3:obl:in	_
11	with	with	ADP	IN	_	15	case	15:case	_
12	a	a	DET	DT	Definite=Ind|PronType=Art	15	det	15:det	_
13	large	large	ADJ	JJ	Degree=Pos	15	amod	15:amod	_
14	propane	propane	NOUN	NN	Number=Sing	15	compound	15:compound	_
15	torch	torch	NOUN	NN	Number=Sing	3	obl	3:obl:with	_
16	(	(	PUNCT	-LRB-	_	15	punct	15:punct	SpaceAfter=No
17	much	much	ADV	RB	_	18	advmod	18:advmod	_
18	larger	large	ADJ	JJR	Degree=Cmp	15	amod	15:amod	_
19	than	than	ADP	IN	_	22	case	22:case	_
20	the	the	DET	DT	Definite=Def|PronType=Art	22	det	22:det	_
21	plumbers	plumber	NOUN	NNS	Number=Plur	22	compound	22:compound	_
22	torch	torch	NOUN	NN	Number=Sing	18	obl	18:obl:than	SpaceAfter=No
23	,	,	PUNCT	,	_	28	punct	28:punct	_
24	but	but	CCONJ	CC	_	28	cc	28:cc	_
25	it	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	28	nsubj:pass	28:nsubj:pass	_
26	can	can	AUX	MD	VerbForm=Fin	28	aux	28:aux	_
27	be	be	AUX	VB	VerbForm=Inf	28	aux:pass	28:aux:pass	_
28	run	run	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	3	conj	3:conj:but	_
29	of	of	ADP	IN	_	32	case	32:case	_
30	those	that	DET	DT	Number=Plur|PronType=Dem	32	det	32:det	_
31	propane	propane	NOUN	NN	Number=Sing	32	compound	32:compound	_
32	cylinders	cylinder	NOUN	NNS	Number=Plur	28	obl	28:obl:of	_
33	you	you	PRON	PRP	Case=Nom|Person=2|PronType=Prs	35	nsubj	35:nsubj	_
34	can	can	AUX	MD	VerbForm=Fin	35	aux	35:aux	_
35	buy	buy	VERB	VB	VerbForm=Inf	32	acl:relcl	32:acl:relcl	_
36	for	for	ADP	IN	_	39	case	39:case	_
37	a	a	DET	DT	Definite=Ind|PronType=Art	39	det	39:det	_
38	gas	gas	NOUN	NN	Number=Sing	39	compound	39:compound	_
39	grill	grill	NOUN	NN	Number=Sing	35	obl	35:obl:for	SpaceAfter=No
40	)	)	PUNCT	-RRB-	_	3	punct	3:punct	SpaceAfter=No
41	.	.	PUNCT	.	_	3	punct	3:punct	_
